animation turning back on itself (UE 5.4)

Hey
im making a small animation sequence in UE 5.4 using retargeted mixamo animations and after I added keyframes to rotate and move the model the animation I’ve labelled “Runningstart” (if you search running on mixamo you should be able to find the one im using) has begun looping back on itself this doesn’t happen with the original or retargeted files and only begun happening after I added the keyframes
I don’t think its just due to the keyframes as I had an old version (same scene same animation just a longer room) that worked perfectly so I have no idea what I could have done different
Id like to keep this animation In the sequence as I like the effect it gives so id really love if someone can tell me why its doing this and how to fix it

I’ve attached a link to a screen recording displaying the issue and that it seems to be dependent on the location and rotation keyframes (id add it as an attachment but this is my first post so i cant do that yet)
https://youtu.be/Y9SZHMzRD2M?si=vJteusVS5F8nZmSD