Why does my Samsung Galaxy J3 (2016) blue flicker when texting while on another app?

So when I'm on another app and I get a text from someone I can reply without going to the messaging app and when I start texting I get blue flicker and it's really annoying.  How do I fix this?

Looks like a buggy app. Can you tell me which text message app you are using? I'd like to try too. For the mean time, I suggest that you use a different text messaging app.

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