Nexuiz

When observing you can see some weapon accuracy stats.

Because of a timing issue (packets with stats info arriving from the server after you have become an observer) the client nulls the local stats arrays but then receives an update from the server. This update could be your stats or the from the last player you spectated.

To recreate this, play on a server that shares weapon accuracy stats, press F5 then spectate, you should now be an observer, press ALT.

A simple would be to hide the accuracy screen when observing, a bit like the warm-up phase.