My iphone's built in calculator is performing addition wrong, is there a reset button or calibration feature?

My iphone's built in calculator is performing addition wrong, is there a reset button or calibration feature?

What do you mean by doing it wrong? Give us an example

Yeah, an example would help.

I could Say that the moon wasn't in its correct orbit,
but unless I could Demonstrate what I said to be a fact,
I would have Very few sympathizers.

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