As shown in the screenshot below a player by the name of [honeymin]
joined the server earlier and proceeded to advertise another server's IP twice before rapidly leaving again.
if you note in the screenshot when he joined he was not welcomed to the server. indicating he has been here before.
combine this with the fact he made a very rapid retreat i have reason to believe that he has done this before multiple times.
what i believe to be happening-
-joining the server every so often
-checking to see if any staff are online
-if yes leaving and/or acting normal
-if no proceeding to advertise [presumably his/her's] server IP.
-leaving before a staff member gets online to deal with it.
in the thought that this is happening regularly and will possibly continue to happen. i would greatly appreciate you look into this
~Road