Yep it was probably the host of a server edditing memory values.
Someone told me about some program Overloard made it lets the host change thier own nickname when they are hosting and my guess is that they probably converted it so it eddited another players name.

And I thought it was impossible to warp other players to another position; probably eddited the memory values to make it possible.

Roseta told me about this: She went to Blurredd's server and when she left the server; someone elese and her names changed and became big;
another problem she had: the end of her name once changed from JOL to LOJ or something; she quit Jj2 and eddited regedit then changed it back; closed regedit then restarted Jj2.