Hello the version i am using are

Lootbags - 1.12.2-2.5.4b
Forge - 1.12.2-14.23.2.2624

and my issue is with the bag Storage it seem you have get pretty much any items out of it
here how i reduce it

1. get an loot bag
2. place down the bag storage
3. right click your loot bag and take 1 item
4. put the loot bag into bag storage on to the first slot into the Storage:
5. take out the look bag out of the slot that say Needed: right click your bag and you end up with random items in it

Not a bug, correct behaviour when
B:"Prevent Merging Opened Bags"=false
in lootbags.cfg

Thanks you