There was a new plugin installed today, and I find a problem because when I am mining, I can't warp to the same mine twice in a row. This includes other commands like /heal, or trying to warp to a person's plot twice. Thanks for looking at this thread.
Due to this, you can add a colon ( : ) to the end of it, such as /back /back : /heal /heal : All it does is allow you to say it again. It was implemented to prevent the majority of spammers.