I’m the same way. I post mostly from my phone, and this dang predictive text on this phone is annoying and the spell check will automatically “correct” something I type despite it being spelled correctly in the first place.
I posted this a while ago:
“Limbaugh did a joke commercial on that, long ago.”
When I proofread it, the word “synagogue” appeared where “joke commercial” is. Beats me how that happened.