Hi trough,
This is a very nice looking little spaceship you have going, well done!
The reason the front and/or rear of you ship staying stationary looks weird is because of the bizarre movement your wings are following. They are folding and collapsing upon themselves in a movement that is more akin to rolling and yawing at the same time, rather than rolling alone.
If it was your intention to roll and yaw then you will need to shift your jet nozzle left and right with the movement (an easy fix, so I've left it, but if you'd like an example just ask).

Here I've made a simple construction edit of a roll around the centre axis. It is one frame shorter than yours because I ended up making the movements larger and was too lazy to fix it afterward.

I kept the angle between the craft's body and all the wings the same throughout the animation (or as best I could in a quick edit).
Also note that I increased the width of any plane that is approaching horizontal and decreased the width of those becoming vertical as that is what this view would do (3rd person view that is). This is most notable on the turquoise wings.
Please let me know if I've been unclear, or ask anything else if I didn't elaborate enough.