Random invisible wall down one side of my level that recently appeared. Anyone had this before?

Hey there, I have a level which seems to have randomly generated an invisible wall. I’ve checked mesh collisions and blocking volumes but I’m really confused why this random blocker has appeared. It runs down one side of my level only. Has anyone else had this issue?

Any chance of a picture?

So what I did to find the offending collision was to add a box collision with an overlap event that prints a string of whatever actor it hits. Managed to find out it was a dodgy sign i had added.