Armor duplication when shooting myself with an arrow

So, I was bored and wondered how much damage my fully enchanted bow (w/ instant damage 2 tipped arrow) would do if I shot myself with it. And when the arrow hit me I must have literally died a thousand deaths, because the in-game chat was just full of just my death message over and over. And when I came outside my base a whole pile of just exact duplicates of my armor were on the floor. My shuker boxes, tools, and whatever else that was in my inventory were not duplicated strangely.
My bow had Power V, Infinity, Flame II, and Punch II with an Instant Harming II arrow.
My entire set of armor had Protection IV, Unbreaking III, Thorns III, and Mending. Including the enchantments that are only meant for helmets and boots.
I'm thinking it might have to do with my thorns enchantments? Maybe shooting myself made the armor use its thorns effect on me, causing more and more damage every time I'm harmed.
Another weird thing to note is that each set of duplicated armor has widely different amounts of durability from one another. I tried burning it all with my flint and steel and then I had realized you can't burn netherite things haha.
Also, please excuse the choppy, inconsistent framerate of the video. My actual gameplay is smoother, it's just my laptop isn't good at recording things on-screen. I hope you can get the general idea from it.