Why is my IPhone 8’s microphone turning on randomly in messages?

My microphone does not turn on randomly anywhere else besides when I am texting. usually it will happen after a couple of minutes into texting, but it doesn’t happen every time. Today I clicked on a message that had just come into my notifications, immediately my microphone turned on and the music I was listening to in the background stopped. And when I say my microphone turns on, it’s with the orange dot in the corner of my phone. In the control center it will say messages used microphone 

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