Some frames disappear when exporting

I am doing walk cycle for a school project and everything was fine until I tried to export the animation. In both OpenGL View and Render View my animation is fine, nothing is changing and it it as its supposed to be. But, when I try to export it as a movie (H.264/MPEG-4 (*.mov)), my characters’ upper leg disappear in certain poses. It only happens when exported, I can’t seem to find what is the problem.
teste (exported movie)
Toon Boom Harmony 21.1 Premium_ a80305_AnaRaquel_Walk Version_ a80305_AnaRaquel_W2 2023-05-17 23-21-14 (OpenGL View and Render View)