This looks to be the same bug I’m getting on my map.
https://forums.unrealengine.com/t/player-movement-very-glitched-and-stuttered/
Some of us have noticed that it is only happening on round 1 of a game so we are ending round 1 as soon as it starts and moving to round 2 to avoid the issue for now. I posted how I did that in my thread if you aren’t sure how. Also, other people have been turning the affected assets to moveable assets which seems to be fixing it although there are considerations with doing that. Again, we talk about it in the thread.