I sometime notice spellcheck chooses different spellings for me and have to be careful to check it didn’t change what I typed. Hopefully that is it, but there are more important matters one should be great at.
I believe Trump will occasionally “misspell” a word in a Tweet to get it more attention. Evidence of this is how the same word is spelled correctly in other Tweets.
Trump is going to be trolling hard the entire DNC convention week. It’s gonna be a blast!