What's wrong with steam?

Well if I check my inventory I've lost a couple of coupons as well, but not tf2 items. The forge coupon was about to expire in 2016 if I'm not wrong - did they remove those?

Contact the support? :(

Restart Steam or relog

sounds like a display bug. have you tried turning it off and on again(exit and restart steam i mean)

now I have some sipral knits item that i had not before....

And Steam removed hours played from library, when you clicked on a game in library you've seen your hours played but now they are gone, why Steam, why????

Try restarting Steam, that normally fixes it, or at least give it some time. This has happened to me before and after restarting or letting it stay like that for a while, it fixed itself. Don't worry.

this also happened to me a while back, for some reason i didnt panic, forgotten about it and it resolve by itself.

Are the items gone, or did the tab for the game completely disappear? I've had the latter happen to me for random games sometimes, it'll resolve itself eventually, the items are not gone.

My Spiral Knights tab disappeared over a year ago and never came back. I haven't played the game in ages so I didn't bother to complain, but I did have a lot of items in there. When I do a trade the option for Spiral Knights is missing from there too. It's like I never played the game.

Steam support :D and then wait for 1 week for them to reply

Wkwwkwkwk

How did you acquire those keys? Also, in your inventory I don't even see those tabs, only Dota 2 and CS:GO :/

Sometimes parts of your inventory vanish until you get a new item. Happened to me last week.

Sometimes parts of your inventory vanish like some said. Sometimes the whole inventory goes away :))
I have this problem every now and then. Don't know any fix for it but it started happening when the added the community option within the client.