I was having some weird problems where when I tried to look at my reservation, sometimes it was missing 2 of the people from my room. I cleared all my cookies and browser history and it fixed the problem.
I was having similar but then it kept rerouting me to a page about the Skyliner. Like I'd click on "Plans" under MDE and ten seconds later a skyline info page would pop up. I ended up calling Disney and trying to figure out what I was working on and it still took a really, really long time on their end (though luckily I got a great, helpful cast member).