My IPhone back face microphone is muffled?

So I was recording a YouTube video y'know and after recording 3 minutes of footage, I checked it and noticed that my voice is muffled. At first, I thought it was my app acting up so I decided to record with the regular Camera app and realized that it's my microphone that is the the problem. My front face microphone is working fine but the back face one is a different story.

How do I fix this? This is an IPhone 7 by the way with IOS 11.2.2.

Maybe there's only one mic,
and the body of the phone is blocking sound from the opposite side.

Just a Thought…

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