Do you have maps with invisible walls inside and don't know how to solve it?
Well, those invisible walls are called collisions, and the reason for this problem is that 2 or more maps are close together and in most cases share the same collisions. And that they then conflict creating these invisible walls.
You can solve this problem with software called 3ds Max and an extension called Gims Evo that allows you to edit game maps.
However, it's complicated to explain step by step how it works to remove them, so I'll leave you with a video that explains how to do it.
We know that it is difficult for many people to do this kind of work, so we recommend that you go directly to an expert.