Weird issue where any "2" that is alone will become "2x"

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I have an issue where if a string has a "2" alone, it will always become "2x" and this seems to universally happen. I've tried regex, post-processing, pre-processing, and even substitutions to stop it, but it always becomes "2x."

Does anyone know of an approach or debug process I could use to find what exactly is happening?