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”.
Some weirdos write decades as possessive. Writing “90’s” implies that there’s a 90 that owns something.
It’s not a decade thing. People do that anytime they’re not sure if it’s a “s situation” or a “ies situation”, or confusing with some other plural problem.