It happens because of blending between walking blend space and captured pose. I can’t test it right now without headset, but it seems that anim blueprint from new demo project should work correctly (it looks like this: https://sun9-52.userapi.com/c857636/v857636790/e4586/wyXwxtRYX9A.jpg). If you already use it, try to add idle pose in the center of walking blend space and remove switching between Pose Snapshot and blended pose: https://sun9-18.userapi.com/c858532/v858532790/48aee/yysZNexSojo.jpg
