Something like this has happened to me a while ago. The solution someone gave me may or may not also help your problem as well. -
While in game press windows + r or open the start menu, then type 's nd vo l . exe'
This'll open up your volume mix er and you can see the volume of individual programs, not sure if this is the problem you're having though.
Sorry if this didn't help you at all but hopefully it does.
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