IPhone Screen Save During A Call?

So I'm sure we all know that when you call someone or someone calls you, if you put the phone up to your face
A sensor will shut the screen to standby
My iPhone has done this until recently
I'm wondering there's something I can change in settings?
Because it gets annoying when I'm on the phone and all the sudden my ear decides to call someone else.
Any tips would be greatly appreciated!
Or just let me know if I'm screwed

I don't exactly understand the question, Are you saying your phone's screen doesn't turn off?

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