Character mesh stretches when retargeting animation

Hi all. I’ve been trying out the new 5.4 updates and I’ve worked on retargeting a few Mixamo animations to a new character so I can use the Motion Matching tools. Currently, I have my character’s bones renamed to match that of the Mixamo skeleton. Every time I try to retarget my animation the character’s pelvis stretches. I’ve tried renaming bones (thinking I named something wrong) and that didn’t work. I’ve also tried checking the Retargeting options in the Skeleton Tree and everything looks correct under the Animation dropdown option.

Does anyone have a suggestion to what could solve this problem?