Same here, but I knew the correct pronunciation of the word when spoken, I just didn't know they were the same damn word. When it finally clicked in my head, I about slapped myself.
Dude, that's how I was with dachshund. I heard it spoken and assumed it was spelled something like "doxen", and then in my head I pronounced dachshund as "dash-hund"
Gabriel Wyner talks about this phenomenon in the first chapter or two of Fluent Forever. Can't remember what he called it but rest assured that you are not alone in experiencing this :)
This unlocked the epitomous memory of me and my mom in the car and the radio show host trying to bust out his best vocab with epi-TOme. She bust out laughing. I feel like something similar is coming back 'round to me, just found out it's epitomic. Not even sure how to pronounce