It's not an issue. It's a curiosity. Language is always changing, nothing is correct, everything is about what's convention.
How come Dick and Jane never said "uh oh". Was it because the writers couldn't figure out how to spell it?
My sibs, all born as I was, in Connecticut, say "uh oh" but I may have picked something up in my speech by living in the West for twenty-five years. Now I have to check with folks in Oklahoma and Texas.
Scooby-do says "Rut-row". Definitely has a 't' at the end of the first syllable.
Joe( what do you make of that