Authors are people. (All of them I know are, anyway.) People who spend a deal of their time in some world other than 'reality'. So you shouldn't be surprised if they are sometimes confused when trying to deal with the real world. They are bound to make a mistake here or there. Following are some of the more humorous mistakes I have made.
A few years ago, I sent a short story to a magazine for consideration. It was rejected. At that time, I was trying to follow the adage, "When a story is rejected, shove it in a new envelope and send it to the next market." So I shoved it in a new envelope... and sent it right back to THAT magazine. I was so embarrassed a couple days later when I realized what I'd done and had to draft an apology letter to that editor for wasting his time. Oh! Color me blushing! (You know, I'm not sure I've ever sent another story to that magazine for consideration. Maybe I should. You don't think they have my name on some 'Never accept a story by this person' list, do you?)
Later, I saw a call for submissions and thought I had a story that would fit what they wanted, so I went online and got all ready to submit it. But I had to open the file, because I didn't remember how many words it was, and when I opened it, it was all set up for a rewrite! (Draft F, orange 16-pt Franklin Gothic font.) Did it really need a rewrite? I read through it, and only found one word I deleted, so no, probably not. So I changed it into proper manuscript form and sent it off. Can you imagine how embarrassed I'd be if I'd sent it off in a big orange strange font?
And then there was the time my dog ate-- No, wait. That wasn't me. Was it?
I get so confused out here in the big real world!
Excuse me. I'm going back inside one of my universes. If I get confused there, the characters always set me straight.