That is exactly what it was. I had
It's related to typing fast only in that when I'm tying fast I'm not really paying attention to the actual results, and I get surprised when it suddenly picks a file I wasn't expecting.
Is there any way I can stop it from maintaining a select_file list? It's a cool feature, I think, but it also requires me to hold more state in my brain. I'd rather type "calllst" or something to get the list file than have it remember (and have to remember myself) that "callbac" means "callbacks.lst".