I just read that bitstamp posted the following on twitter:
We have disabled live order book updates. We will enable it back as soon as we upgrade our system.
This seems to tie in nicely with the questions raised in
this thread in the Service forum (basically: it looks like Bitstamp matches orders that were placed in quick succession "internally", before they can appear in the order book).
Finally, I know (from other posts here) that I'm not the only Bitstamp user who is not entirely happy with the trade interface, mainly that you don't see a live version of the order book and properly updated market price in the buy/sell screen.
So in conclusion, could you perhaps elaborate a bit if Bitstamp is aware of these issues, and if you are planning to resolve them, and how?
Bitstamp is a great exchange, but there's always room for improvement :)