When I play Minecraft Realms (Bedrock edition) my shulkers multiply when I leave and re-join.

it happens at random, i could be hunting mobs, building, exploring, ect. I will have my stuff in my inventory, leave, re-join a few minutes later. And instead of 1 shulker box I’ll have 2. The first time it happened I found it funny, I was collected tropical fish and instead of 1 shulker fulled of fish I had 2. It happened again just now, I had a axolotl in a bucket before, it duplicated and now my axolotl has an exact copy of it self. 

it only ever happens when I have space in my inventory and I leave with my shulker still in my inventory, both these situations happened this month in June. The days were back to back.