Rearranging items in inventory is, most of the time, impossible. It's happening with pets, seeds, everything. When attempting to move pets, the same snapping back happens and the pet is unfavourited at the same time.
#Will. Not. Move.
north creek
dull wagon
sorry about this - we’ll fix this asap. probably monday
north creek
Yup, get your rest in, you and the rest of the team 
left condor
It's happening on my phone too
empty tiger
I found a temporary solution until a patch gets rolled out if you need/want! ~I shared it on another thread, here's a link to it!