Hype applies perspective to 3D rotations; it has been a long standing request for this to be configurable. You can override through a CSS rule (in the HTML head) like:
perspective: none !important;
Alternatively, you can also better control the perspective by making the element bounds smaller (just to the ellipse) and then putting it in a group. There will still be perspective, but it won’t be dependent on the position if you are moving the group.