Mercenaries Collection "My Parties" Bug

If I create more than two parties under “My Parties” in the Mercenaries Collection, after about 30 minutes of play, the order of the parties in the 3x3-grid (and vertical-9 list) completely re-arranges itself, the original intended ordering is lost

I did a little test and created 9 sequentially labelled parties: Party 1, Party 2, etc to Party 9. Logged out and back in the next day and it is now ordered Party 4, 5, 6, 7, 8, 9, 1, 2, 3