It has always behaved in a weird way, as in sometimes it will show for example 100 hours but after the game was closed it went to 98 even though you have been playing actively for the entire time. But lately it has started doing very weird things, like subtracting hours entirely. I can have a game sit in my library with 500 hours and then i launch it only for steam to remove 7 hours.

What's going on? Was just curious, i don't really care a lot about those hours but i feel like they are not very reliable when i see such behaviors.