Problem with animation character

Good afternoon, I ran into a problem in the character’s animation, created the character, inserted the skeleton, set up the skinning, in Unity I distribute the animation and strange things start to happen to the character, attached a screenshot. His body bulges forward, and his head rushes to the left all the time. I believe that the problem is not the docking of the loaded animation for my character, because I load the character from the asset from which I took the animation, I reproduce everything and everything is ok. Nevertheless, this is just a guess, if anyone knows, tell me how to fix this defect and what could be the problem as a whole? Thanks in advance!