Basically the phone app replaced all my FP+ A&E selections when I tried to copy a FP reservation. The online website provides a warning; the phone app does not but instead states "successfully copied" when in reality its copied what it can and replaced the rest!! Here's my email I sent to WDW online:
Good morning,
I spoke to a online technical support person this morning, named Ireland, this morning and she suggested that I contact WDW Guest Mail. Here's the details of the issue:
My group is coming to Disney World and staying onsite Oct 12 - Oct 18. At midnight Day 60, I made all my FastPass reservations online. I have a party of 7 (not including an infant), so I made multiple, small reservations one at a time for members of my group.
After completing my selections, I had obtained the elusive "Anna and Elsa" reservations for my group, although we were spread out on days 10/15 and 10/17. Using the Disney app on my mobile phone, I then attempted to copy my reservations from one member to another. The phone app indicated it was copying my reservation to the rest of my group and showed me the correct reservations. However, when it copied and didn't find availability, it dropped all the Anna & Elsa reservations, and without warning, replaced it with a new auto selection. The app further stated "successfully copied" without any indication it had made the replacement!
I explained to the tech support person this morning that the app developers need to include a warning when there is insufficient availability. The WDW online website has this functionality, as it warns you and provides a few backup options, but the phone app does not. She agreed, and said she would submit a developer request right after we ended our call. However, as a result of this, the app replaced my party's Anna & Elsa's FP reservations. When I realized what the phone did, I attempted to get them back but could only get one party member a reservation on 10/15 and a few more party members on 10/17 (we're going to MK both days)
I apologize for the length of the email, but I wanted to explain the Fastpass error in detail. I'm requesting a callback to discuss the matter and see if any options are available to me. My contact information is below:

