First of all, from my minimal knowledge of geology, mountains that seem to be sagging or leaning to one side isn't really a problem at all. With tectonic plates moving around and colliding, causing the landscape to fold, or with heavy sheets of ice pressing down the terrain for thousands of years (and then melting, resulting in the terrain rising up again), you get a lot of terrain that seems to be falling over, which looks imbalanced.
That being said, how much are you using references for this piece? This seems like a sort of question I myself would ask and then try to figure out rationally or by experimentation, instead of just... looking at real mountains. (I've just made this realization working on another piece, where I was struggling for the longest of times trying to get the mountains to look right, before realizing I hadn't really used any references at all. Which is kind of dumb, at least for someone at my level)
I don't think this looks problematic at all, it looks great. In fact, it looks relatively symmetrical for a mountain. You can always do more of what you've already done, which is to break up the shorter, steeper side with a few big chunks to put more "weight" on the short side, as it were.
