Camera rotation glitches

Hello everyone. I have a problem with quaternion camera rotation. When I do it - model stretching and I can’t find a problem. Maybe someone had the same problem or has a possible explanation of this camera behavior. I’m using OpenGL 3 and custom camera based on dhpoware demo. Demo video . Thanks.

It looks like your field of view is too high!
Try a FoV of 68.

Thank’s for reply.

I’ve tried 45,60,90 - same result. There is another demo:
FOV - 68
Near - 1.0
Far - 100.0
Position (eye) - (0,0,8)
Target - (0,0,0)

Rotation -
Movement -