Those counters were probably produced by your opponent. I don’t think you have ability to remove opponents concealment counters?
This is most probably the case. If so, then the given Concealment Counters are "owned" by your opponent even if you use them.
This might even have the following effect: You put a "?" counter "owned" by its creator (i.e. the one who pulled it) on a stack of unconcealed units owned by you. Everything will be concealed. But if you pull off the top concealment counter "owned" by its creator, the units beneath might remain concealed to
you because they previously "received" their Concealment status from the Concealment counter
not owned by you. The interpretation of the program (under normal cirumstances correctly so) is that you are not elegible to remove your opponents Concealment status. Unless a setting in the Preferences is selected to do otherwise. But this will not help in cases if the VASL setup file is created by a third person and none of both players actually using it are involved.
The problem usually occurs when using pre-made VASL setups in which stacks of Concealment counters are pre-pulled for both opponents by the creator of that file.
The problem can be avoided by using a labelled blank counter specifying the number of Concealment counters each side is elegible for. This will ensure, that the actual Concealment counters will be pulled by their "true" owners while the advantage of saving time by pre-pulling all unconcealed stuff is retained.
This is how I handle it for my setups:
If you do it like that, you'll be fine.
von Marwitz