Please state in which country your phrase tends to be used, what the phrase is, and what it should be.
Example:
In America, recently came across “back-petal”, instead of back-pedal. Also, still hearing “for all intensive purposes” instead of “for all intents and purposes”.
“Could of…”
It’s “could have”!
Edit: I’m referring to text based things, like text and email. I can pretty much ignore the mispronouncing.
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It’s definitely a mistake, but I think it has slipped by because spell check wouldn’t have a reason to mark it, and not everyone uses grammar check, so they think it’s correct to spell it out by the sound of the contraction.