GS7 Edge turns its sound on after receiving a call in vibrate mode

When I have my GS7 Edge set to vibrate and someone calls, it will vibrate for that call but then turn the sound back on. So, if I don't turn the phone back to vibrate, all the sounds for my phone are turned back on after one phone call, even though I had it set to vibrate in the first place. Is there a setting or button that will prevent this?

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