Same version but different check amount

Help me please.
When trying to play with a friend on the same version, without mods and add-ons, we have different check amounts.
We could not find an answer on how to fix this and how to change the check amount.
Since when trying to access the server, either a friend or I received a message like "The version of the client and server are different", while we have everything the same.
PS We tried to reinstall the game.
PPS We tried on other versions, the same thing.