I fuck up a lot of words personally, because I read a lot but grew up in a hick town, leading me to learn a lot of words through text rather than hearing them. Stuff like that is pretty common. As people become more and more online, with less in-person interaction, it grows more common for someone to learn words in this way and go years without ever hearing it pronounced, potentially leading to the mispronunciation being ingrained as a default even after being exposed to the correct pronunciation. I still screw up the pronunciation of words I know how to pronounce casually, because I need to remind myself that it's not pronounced how my brain defaults to pronouncing it any time I verbally speak it. There are also regional dialects with different pronunciations.