Commands Show in Chat.

[demon99088]

So i am on my Tekkit Classic server. And i see that when i op or add someone to a group the message shows up in chat saying [name]:added [name] to group [group]. it also shows the commands like when you spawn in items etc. its really annoying when we are building and need more materials because all players can see this. is there a fix for this? if so please help me! thanks.