Why are my message alerts getting stuck?

I have the Moto Force Z, and after I read a text message, the app still shows a number on it. I've rebooted, and it doesn't help. I've also removed several apps, thinking that maybe there was a rogue app that caused it to glitch like that, but it's still showing numbers. And each new person that texts me, the number indicated on the app increases. Can anyone suggest how this can be corrected?

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