The characters legs detach when I build the game into EXE file

Hi! So anytime I build my game, the legs always detach from the rest of the character. They use the PreviewAnimInstance to attach onto the torso and hands that work PERFECTLY. The weird part is that it works perfectly fine when in the editor, all of them do; however in the final build it just kinda detaches from itself. The link is on my drive, since the video is too large to put on here: 2022-08-19 11-52-06.mp4 - Google Drive