Let me guess, you were watching on Mtgoxlive or something using the same feeding method.
This is one of two known bugs. Ignore it, it didn't happen. The two bugs are on new changes: one does and undoes them frequently, the other adds it twice, then undoes it a few iterations later.
Don't trust these order book pages, they're written by people who think it's funny to never do any sanity checks, never correct the view and induce extra madness. Best proof: the scale on the right side of Mtgoxlive. Come on, after seeing that, it's your fault for taking the site all too seriously. And the CPU usage should remove any remaining doubt of the joky nature of the page. It's CPU mining, isn't it? I hope so, because it's the only sane explanation for the performance.
I kinda miss Bitcoinity. That one was slower in updates, but fairly decent in what it displayed.
This is one of two known bugs. Ignore it, it didn't happen. The two bugs are on new changes: one does and undoes them frequently, the other adds it twice, then undoes it a few iterations later.
Don't trust these order book pages, they're written by people who think it's funny to never do any sanity checks, never correct the view and induce extra madness. Best proof: the scale on the right side of Mtgoxlive. Come on, after seeing that, it's your fault for taking the site all too seriously. And the CPU usage should remove any remaining doubt of the joky nature of the page. It's CPU mining, isn't it? I hope so, because it's the only sane explanation for the performance.
I kinda miss Bitcoinity. That one was slower in updates, but fairly decent in what it displayed.
+1 on MTGOxLive. I can't believe that in 2012 it is still impossible to display a live graph on the screen.
I used to have issues with Bitcoinity too though, always messing up the graphs.