I have found that I have to export my project to Word or Pages to catch words that my Scrivener seems to think are spelled correctly. Not just the British English spellings.
When I misspell arthritic, I am given the spelling “athkridic”
When I right click on “athkridic” it has no “unlearn” option, so it doesn’t seem to be in the custom dictionary.
This had happened to me several times with various words. I am afraid I didn’t make note of the words or their misspellings, as I was on dead line. I will try to keep a record in the future.
Has anyone else had this problem.