all my trades are showing different items than what they were supposed to be

its happen already in 5 times............

сука заебали, хоть бы откаты делали.....

likewise... Everything got all jumbled for me too.

same here

says Unknown misc item in my trades just recently.

And search function isn't working well

yeah, all the cards turned into 'unknown misc items', what's happening? :/

I put in Rogues Legacy, Super Meat Boy, and SIm's 3 into a trade, and it turned into a Unknown misc item, a Cave profile background, and Tom Clancy's Splinter Cell Conviction :/ And, searching is broken as well.

I just speculating, but I guess the new trading cards caused this "glitch", because they messed up the steam inventory items' IDs. (games, trading cards, backgrounds, emoticons, coupons etc.)
It doesn't affect my TF2 item trades at all, thats why I think this happened.
And if it is really about the messed up IDs, then I doubt outpost can fix this. (Just re-open your trades.)

Better wait for confirmation from Sneeza. There were bugs like this before but never this bad, hopefully we won't have to recreate trades.

EDIT: There:

We've identified an issue with Steam Inventory items showing up incorrectly — please refrain from creating new trades containing these items while we investigate.

EDIT2: Fixed:

Most of the Steam Inventory schema was corrupt as of 7pm UTC, so we've had to revert to a backup. Some items may appear broken/wrong — if this has happened in one of your trades, then please close it and re-make it. Once again, we apologise for this inconvenience.