Hi!
I think there is a mistake with the drag-and-drop option and reservations for more than one room.
In my case, I made a test reservation of 4 rooms corresponding to the Standard Double Room Type, for the dates 01 August - 04 August. Then I enabled the drag and drop option and moved the reservations of the 4 rooms (one by one) until August 7. After that, I left Solidres, cleared the cache and when I went back into Solidres, on the calendar, 3 of the 4 reservations disappeared. When entering the edition view of the reservation, the 4 reserved rooms were assigned to a one room, which in fact was the last one that had dragged.
I hope that despite the bad English, you can understand
Regards!