In-call Volume when not on the phone.

[AC Question]

I just finished a call and now every time I press the volume key (which I have set to control media volume) an In-call volume is controlled. It happens every time I end a call and it won't stop unless I reboot my phone. I'm talking about my Samsung Galaxy S8+, unlocked, bought from Best Buy (Verizon), Android 7.0, Samsung Experience Version 8.1. Please help me fix this soon I also have two other problems but I think it's best to make two more threads to cover those.