Cards/Cheat tokens etc cant change their state and/or disappear without some sort of user input. Like all things program related, the module can only do what the user tells it to do - it can't do things on its own

Be sure to record a log next time of your games which we can step back and look through to help capture any problems though. It helps to see what the users are doing and if they do something inadvertent. Also check all users are using same version of vassal and of the module. Make sure there are no mismatches just in case there is a potential compatability problem.