I've been pricing out a few upcoming trips -- different details, all of them -- and on all but one of them, when I went from the list by price to a specific choice, I got the "fare changed - check box if it's okay" message. Of course, they're always unfavorable to me, and I realize availability changes, but I'm just shocked to see this happening on 5 different unrelated trips. Any ideas what's going on here--it's very annoying.