We booked 7+3 to 7+6 days out and I'm (unpleasantly) surprised that "Modify" doesn't seem to work very well.  I'm wondering if I'm doing something wrong?
Here is what I've been trying to do - I feel like I must be missing something.  For stuff in the future (not day-of), to see available times, I click on what I want to change (let's say Haunted Mansion, 10-11 am), then I click on "Modify Selection."  Then it shows me better times than what I have (e.g. 9:40 am) - great!  I click on, "Change to This Time."  But now it gives me a new window with a much later time (like 12:15 pm), and a message - "Modify Time - Please note your arrival window has changed." 
I don't like that time, so I go back and repeat this process.  Once again, it shows me the same, better time that I saw previously (9:40 am) - great!  I pick that better time again.  Once again, it gives me a new window with the much later time (12:15 pm), and the same message - "Modify Time - Please note your arrival window has changed." 
Note that I don't have any earlier time that would create an overlap.  Why can't I get that earlier time?  What am I doing wrong?
I am worried that this will also happen on the day-of.  When we can see earlier times available, will we actually be able to get those times?