Armor duplication on hostile mobs

So we have a realm that we we're playing on and we discovered a bug that a zombie duplicates their armor when they're stuck on the bottom of the water this bug always happens nearby a ocean or a built pond. (hope you'll fix it♥️)

I added a video and other Picture to make it more clear to you administrator♥️

Update: i added another proof of the bug existing hope it helps you admins to recognize more what i am talking about.