@BO-DACIOUS All good, so since we know it’s not the navmesh, we’re gonna have to look through everything like LFA mentions, a video would be best, decent quality if you can.
Character BP
NavMesh Bounds Volume Settings (and how it looks in general)
AI Controller
Behavior Trees and Blackboard
etc.
Edit: also had an issue recently that was that their world was world partitioned and that caused an issue with the navmesh Simple Ai Not Moving? - #16 by KinGxSeGaL1 This is likely not your problem but I figured I’d mention it for the sake of it.
As much as you can show that’s relevant. Enjoy your sleep!