I don't know if this is what you are experiencing, but I 've noticed that the .us dates have been flakey. I had 5-6 lined up, and now they are showing that they've been recently reggd and the expiration is now in 2005. These were all pending delete names, acting almost as if they were expiry dates instead. In one case, the name was actually regged for a year a couple of days before pending delete date. There is no way, that I am aware of to determine how the name was obtained, so not quite clear on how this happenned and is happenning frequently and mostly w/ .US deletes.
Pool, doesn't update listings very often, so their dates are atrociously unreliable. I regularly am deleting my backorders that missed, using a whois.