If you have a problem like this, it is a conflict with a around map.
So it is not a problem with the map.
To fix this problem, you need to find which map is causing the problem.
You can't enter of mlo ?
If you can't enter the mlo or walk the entire melo, you have a collision conflict. (.ybn)
Conflict
If you encounter conflicts with other mappings, check if you have this in other mappings with a simple search, and remove duplicates in other mappings, then check if you have a problem with the other mapping in question .