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 )

Ja-lap-e-no chips

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

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

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!

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.

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

Trough?

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.

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