It happens, once a plot went up exactly 1 day before I counted it out to, someone bought it and I had to buy it for double they bought it for. Point is that it's annoying, but not a huge problem.
Noooooo he would never do that ever. That would completely insaneeee, he has never done something like that before ever. What's funny is he posted quite a lot and was identified as Lems on each post but was not stopped until his maybe 6th post.