Well, idk anything about this problem.. all i did was chat with grim
with my usuall nick "[HaRd] Platypus".. then suddenly i got banned.
Well what i remember is platypus joining the deathrun server, and we started talking. I was the only admin there at the time and i did not ban him, also he did not do anything wrong so i don't know what happened.
However before this happened on deathrun_forest me, SNap, Harry and i think regal spotted a banevader, by the name of Neon i believe so they banned him, maybe he had the same IP as you and he was the imposter?
I really don't know what happened to platy but Neon was certainly banned for ban-evading, maybe he had the same IP or not but he might have something to do with all of this.