How to prevent auto-letter doubling?

On my Samsung S6, whenever I place a punctuation mark inside or next to a word, it autodeletes the mark and doubles a letter in the word. For example, it changes didn't to ddidnt. When I go back and add the apostrophe, it changes to diidnt, then diddnt, then finally didnnt. This hapens to all words and punctuation. If anyone has help, please tell me.

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Clarification Request

This happens in every app.

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(NT) What app does this happen in?
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Re: typing

Then it might be time to reset to factory conditions and see if that helps.

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