I don't see a reason why that would happen. I'm using the plugin in more than 10 servers, plus 150 others are using it at the moment and nobody reported such a thing. The plugin need a rewrite though which will include sending the messages without forcing the user to execute a command. I can't tell for sure when I'm going to do that. Anyways, the problem is not from the plugin. You may have some other plugin/protection that's causing this.