I seem to be having a problem with the latest build #1068. When a player goes through the Bungee proxy it will spam that console for that server with "[xx:xx:xx INFO]: PlayerCount" (picture will be included). It is a fresh install of Bungee with no plugins. Joining the server normally with a direct connect with the port does not create spam in the chat. If any more info is needed I will gladly supply it.
"PlayerCount", "GetServers", etc. are the names of the subchannels listed here: http://www.spigotmc.org/wiki/bukkit-bungee-plugin-messaging-channel/ Those look like debug messages from something, though I could be wrong. What plugins are you using on your Spigot servers?