Umayalanaraku

My wife is having trouble with some of her inventory. She will unpack an item, copy it to her inventory but when she takes back the bag or box some of the stuff will automatically repack themselves and she has to repeat the process. Not all the inventory is doing this but several are doing this. She keeps having to repeat unpacking the same objects because they repack themselves after she takes up the bag or box. What could cause this and how do we fix the issue.