I’m not a server owner and I have no idea what to do when you try to join a server running your map after you release an update and the server updated as well, but you and nobody else can join because it says ‘server is running a modified version of the map’.
I’m tired so this sentence was probably pretty awful lol
Their probably running a workshop map or a slightly edited version of a popular map, I would suggest looking at the workshop content they use and downloading it from the workshop before hand, I wouldn’t class this as a “glitch” or “bug” necessarily.
If you do find an issue or bug report it to this topic in gamedev. Were the community can see if the bug can be fixed without releasing an update