this might not be the right spot, my defense, not using umod atm :P running stock. ive tried to find this myself but my results are convulted. so who better to ask. wulf comes to mind. :P
my server is doing:

Toxic[76561############] has spawned
Toxic[76561############] has spawned

every command from my bat file doubled. and my server description is doing the same thing 2 words repeated and i only have to words in my bat file.
it does not seem to be an issue, its more of an ocd thing and the fact i cant myself without bothering someone find the info. i am feeling my bat may have some error but i digress . Thank you

it's related to a plugin generally, you need to find the one cause this... maybe it can be a tools using rcon or similar, not sure about that...