Amputation

(Note: I do not know how to work pictures yet, so they may be in the wrong place) After reading a page by Majic Majora, about playing a world with your username as the seed, I decided to have a go myself. After putting “Puzzle6718” as the seed, I spawned in a Swamp. Personally, I think a Swamp is not quite an interesting seed, but that’s what I got. 
I gather wood at the start of most worlds, but I wanted to explore this one. I found a strange block that almost looked like a surgery table, but not quite. However, it would not let me take a screenshot of it, no matter how much I tried. When I looked at the picture in the camera roll (I play on PE) it was just a blurry turquoise blob on my screen. I was mildly disturbed by this, but nevertheless continued to explore. I found an area of stone that I decided to mine into and made it my home for the night.
when I exited my home the following day, a tree outside was on fire. I was puzzled by this because there hadn’t been a lightning storm the night before, or anything fire-related. Then I realised; there hadn’t been a tree there before. At this point I was really looking at leaving the world, but my curiosity got the best of me and I didn’t leave.
Then I began to hear a music disc, which I recognised immediately as Stal. But during the chorus of the song, I heard screams, which usually can only be heard in disc 11. I wasn’t too bothered by this ,and dismissed it as a simple sound glitch. It began to get dark, and I felt an urge to fortify my home, as I didn’t feel comfortable with a thin wall of stone between me and whatever horrors that awaited me the next day.
When I was sure that this home could resist even an explosion, I said in chat “who’s tough now, ay?”. I made a big mistake saying that. My home got what It hadn’t prepared for. An explosion. from the inside. My home was in shreds, my bed was destroyed, and the music disc was getting louder. So I made a decision. A final decision.
I was going to fight whoever did this to me.
I screamed “FIGHT ME!”,in chat, hoping to attract the attention of the thing that was terrorising me. Suddenly, a bolt of pure red lightning hit me, temporarily blinding me. When the lightning stopped, I could make out a the top of a zombie’s head under the water. I dived in after him. To my surprise, the zombie ran at me, which caught me off guard. Then I noticed that his chest seemed to be ripped open, and his eyes were red. I crouched and held my sword, and hit him. I only took a couple hits to kill him, just like a normal zombie.
I walked back to my ruined house, feeling somewhat scared, when I saw the same zombie. I charged at him, getting a few hits, but when he died, he just appeared again. Holding a Netherite Sword. I tried to kill him again, but my stone sword was no match for him, and I was killed. 
When I respwaned, the Amputation was running towards me, and no matter how hard I tried to run, I was frozen in place. The Amputation seemed to leash me, like a player would leash a sheep. The leash looked like a rusted chain, and damaged me every once in a while. After realising that it was pointless to try to escape, I finally stopped trying to run away and turned around to see where he was taking me. To my horror, he was taking me to the Surgery Table. 
I was too scared to continue in survival, so I left the world, copied it and changed to copy’s gamemode to creative. Sure enough, my loot was still there, but the Amputation was just a regular zombie with a leather cap. I went back to my destroyed house, just to see if it was any different, and saw that there was a sign in the bomb crater. It read “I went wrong, did you?”
did I go wrong?