SteamGifts Derped

Did you play it during the free weekend?

Force Sync your account, any time Monday - Wednesday. If you don't choose to play a particular Free Weekend game, you'll have no problems on SteamGifts. If you do play a Free Weekend game, you'll have the recently played two week falloff as described above.

It's because of the free weekend. Check your Steam client, it's going to show it and say 1 day left next to it. And if you sync during that time, it shows up in your library on Steamgifts. Happened to me as well and it's really weird seeing it show up on things like wastedonsteam.com and AStats.

Though not sure if it will go away if you sync again once it's gone if you don't play it. Never really paid attention since pretty much every free weekend game is either one I own or one I have zero interest in.