My animation is bugged

so im working on my first game on unreal engine and i inserted the animations from mixamo.com and im testing my animations and…
the animation is restarting itself and idk wut to do so here is the vid
- YouTube
so plz help me fix this bug u could comment on the vid or comment on this post…

i got a character and some animations from mixamo to and when i went to rig it this thing of nightmares happend and idk how to fix this