Hi

I think I have a problem with my geologists using the gold-hearted skill.
I can see it usually adds 100 gold units to a gold mine when it succeeds the gold search, but sometime it removes 100 units from my industrial gold mine (and maybe to other mines but I am not sure about it since I don't pay attention to the amount of gold remaining in regular goldmine).

anyone has that issue?
is there anything to do?