server kicks only me from new world

every time i log into this world or respawn in this world i get kicked with this message (99% of the time) which sometimes and randomly crashes the server, but just doesnt let me connect. this world worked yesterday without any issue but now it kicks me, but nobody else with this. no i haven't tried another world but i tried multiple dated versions of this one and reinstalling minecraft on the server with the problem persisting.
any sort of way/fix on this?
(only other time i would see this message was if i did something to lag the server's previous worlds like a bunch of water falling)

while i made this thread the server page returned with an error 504 when i tabbed back into it

Quote from Roman

Please try to remove your playerdata.
You can do that by deleting the players or playerdata folder in your worlds directory.
Please make a backup before deleting anything.

i deleted the playerdata file and re-added what was in my inventory (using creative mode), it worked up until i respawned, then it started rapidly kicking me again.

it isnt the playerdata file, i opened a copy of the world on my local server and there were no issues

i tried a new install of the MC version and new maps but it didnt seem to work, unplugging my dell computer from my mac seemed to fix it for only a day until it started back up. (i never used any mods)

i just did a clean reinstall of the server and created a new world
it did not fix it

edit: its starting to believe i am in the server when i am not, kicking does not remove my ghost clone from the server

i opened a new account and the world there appeared to be fine without kicking me, i toyed with it a little and it still appears to be fine, i then closed the new account so i dont create site spam.
should i re-open the other account or should i close & re-open this account?
(the server reinstall actually didnt clear the MotD which i feel like might mean something)