Sky Factory 2

hello i have a modded server with the sky factory 2 but the plugins do not work and when I put someone op says it puts him in the game but is not op you help me. Thanks in advance

I tried to op or from the console but does not work, and lately while I'm building, after I place some blocks makes me get out of the server.

He not by error messages says that put me op but then the server are not