If the challenges aren't meant to be dead serious then maybe the mods should reflect that attitude by not taking their deadlines and rules so seriously either.
Once again, we can't change the deadlines, that's automated. I don't see how that even reflects any sort of "seriousness" other than it being purely a technical reason. We just put it out there(quite literally, on the front page with a ticking timer), so all users can see it. The rules are created mainly by challenge winners, and if need be, tweaked by us mods(with their permission of course). We just want to respect that user's rules toward the challenge. If there is an issue during the week of that challenge, sometimes we actually DO ask the challenge creator if it's ok to let that challenge submission slide, or allow it. To be fair, that person earned it, we try to follow his/her initial view of how the challenge rules are ran, rather than handing them a gift, dismantling it without their permission and handing it back to them. Just like in politics, it's never the good things you do that get recognition, but more over the bad things. Human nature, I suppose....
I also appreciate that you took your time to post and explain things to me.
However I feel like if the creator isn't there to sort these situations out it's kinda like a medieval kingdom that's run by the villagers. Isn't there a way that more people could get control of the site so these kinds of problems wouldn't happen again. It all seems highly too automated. And I realized I missed the deadline but were the rules clearly stated I would've submitted my single sprite only 
We DO have access to certain things and tools that other users do not. These things help us moderate the site and make sure it's functioning properly, as well as with the general user base. In that aspect, I'm not sure I understand the villagers concept. At any given point, a mod can step down, and another user can fill his shoes. This isn't some figurative monarchy, it's a general community of artists. And every website needs a bit of rules to keep it in check on certain things. I can understand that some views on pixelart differ from site to site, but that's what makes each site stand out! We don't claim to be the definitive of what pixel is; rather, it's just that way the site would rather it be. Please understand this.
If we have something that's TRULY bothersome, we do get in contact with the site creator, and try to make some adjustments. He has and DOES come through for us in those occasions. Besides those strange site issues, it's mostly things that can generally get worked out by us,(otherwise, it's pointless to have moderators, wouldn't you say?).
As for another overcompensation comment, I'm not too sure if that point was made about the way challenges are ran, or just generalizing moderation of the site entirely. It really boils down to the amount of users active on the site. On Pixelation, the volume of users isn't as high, and submission of art isn't as high as well. This makes rules much more easier to pin down, as the general active user base has a firm understanding of them as well, and can easily explain them to newcomers too. This also has lead to what can be percieved to be seen by a newcomer as "a site with elite artists, with harsh criticism", because of it being a very tight knit group(though, I'm glad to see some more lurkers come out of hiding and submitting art....).
Because of this, a user will usually go to another site where he/she feel there are artists more along his or her level. At this point, we get to Pixeljoint. The site is general open to any user willing to submit pixel art, in a gallery mindset; gallery mindset meaning more of a show and tell type thing. Though criticism is still encouraged, some users tend to be a bit over-polite, and avoid any type thinking that they are jerks. And due to this mindset, many newcomers tend to go to Pixeljoint, before they consider Pixelation(mainly going off of user's transitions from one site to another, that I've seen in the past, ever since I've been active on both sites...ie, just my view, not a fact...at least not yet : P) So when these new users come to a "pixel art" site, they're not so keen as to how go about making cleaner pixel art, or pixel art at all. The large userbase also makes it difficult for us to get to each of their questions(though we do get to them eventually, even though most are generally answered by our FAQ page, which hardly anybody ever looks at

) And in this setting, there's no doubt that sooner or later something will be misunderstood, or a catch-22 will be found. That's where we come in to try and sort things out to help them understand. Some issues get resolved, and others linger with time.
We try to guide them, with these set of rules we've chosen, in helping them make better art for display of their gallery. I'm all about improvement, and am glad each time I see a user in the weekly showcase, whose gallery showed how much they've improved from past to present. If any user here has any objection to that on the basis that this "competition" ruins any type of artistic integrity, I think that's down right silly.
Finally, let's get one particular thing straight: we're NOT the only site that enforces rules. Not to be combative, but moreso as an example, does not pixelation enforce it's rules during a challenge? Say for example, in 2008, we're people not to be temp. banned if they didn't meet a Secret Santa deadline? When doing the Hex collab, were there not rules to follow in submitting a tile, or else it would be turned back until fixed? Why is this so much different from the rules of Pixeljoint challenges? I guess I am picking on Pixelation a bit, with a greater reasoning for understanding the mindset, even though this thread wasn't brought about by any mod here, nor does it really represent the general mindset of the site.
I just say this because it truly chaps my bum, that even though these 2 sites have co-existed for so long, that I get the feeling there's some type of passive aggressive view over the other, or how things are ran. It's as if we're the butt of some joke, even though we support activity on this site, and post it on our site. I'd just rather not see the relationship between these two sites disintegrate, because of petty views over each other(not specifically pertaining to pixelation, as I'm sure some pixeljoint users feel the same about this site as well).
In either way, more towards Mike, and without sidetracking any longer, I can definitely understand your frustration. To put it plainly, it'd best suit you to submit something a bit earlier, or post it in the pj challenge thread in the forum if you feel the piece in question is questionable per challenge rules so the mods can make a hasty decision, or give you more guidance.(again, you're not the only one this has happened to. Ask an awesome artist by the name of Stickman, who this has happened to about 3 times now. However, he understands the technicality of the site and gets why it happens.) If you don't give us time to help you, than it's much more difficult to give you time to make you're issue work out. I also hope this doesn't have any affect on future submissions to the site, as you're a pretty good pixel artist.
Thanks again, The B.o.b.