I noticed this in the reputation history page. Yesterday I created an answer for my own question and accepted it as the correct answer and didn't do anything else for the day.
I noticed today that it has reported in the reputation history page as
You don't get any reputation for accepting your own answer however you do for accepting someone elses so I can understand where this history log came from.
I'm pretty sure that the history shouldn't have this logged as there never was any reputation change to begin with. Accepting an answer is already logged in the activity history so this doesn't need to be here.