Retargeting issues with mixamo characters

While re-targeting the ue mannequin’s skeleton to my mixamo character, the joints on my character’s arm bent from the forearm and down in a weird way. Most of the joints were re-targeted correctly, some weren’t re targeted, and some were re-targeted to the same joint, for example, left lower arm and left lower arm twist were re-targeted to left lower arm on my mixamo skeleton because I was following a tutorial. So my question is how to fix this issue? Should I redo the re-targeting or start over with a new mixamo character?