I would say you're actually witnessing the very real phenomenon of language-drift. Languages evolve for a billion reasons, but there's no right or wrong state of language.

That's why we distinguish between language, dialect, idiolect, sociolect. Each bearer of language is also a producer of language. Their version is just theirs, in whatever many ways that makes that version unique.

(Check linguistics to better understand this process of language-drifting )

My wife pronounces ‘foliage’ like ‘foil-adj’.

My favorite example of this happened during a D&D game years ago in which the DM kept pronouncing the word portcullis as PORK-YOO-LISS.

To this day, the word causes the image of some sort of ancient Roman pig gladiator to appear unbidden in my mind.

My wife says "wheelbarrel" and I giggle every time.

The channel this video is from can be a useful resource.

Though I want to know why Wednesday is pronounced "wendsday" or "wensday". The n is after the d!

Panacea. I pronounced it incorrectly for a long time. Never knew because no one corrected me. Fortunately it didn't come up too often.

I said automaton wrong for years. I said auto-maton instead of au-tomoton. I still cringe a bit thinking about it :-/

We've probably all said a sentence that no other person in history has ever said.

You can just look up words in the dictionary and look up the phonetic pronunciation key to refresh your memory. It pays to do this every once in a while.