Why won't read messages disappear from my notifications tab?

I've had the iPhone 6s for exactly two weeks now, and I'm continuously having this problem. One or two random texts messages a week won't disappear from my notifications tab, even after I read it. I click remove, it stays. I slide to the left and click the x or reply, and it's still there. After I turn the phone off and on it goes away, but I don't want to have to keep doing that. Any suggestions? Is this happening to anyone else?

Yeah

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