Wrong P value for old giveaways ?

My guess is that it is connected to the bundle of the two games.
If there was a sale for said bundle recently (ended today?), that put the bundle price below the regular price of the single game, Steam's API reports the bundle price as the price of each individual game. So Steamgifts "thinks" each game is $50. This should fix itself within a couple of days after the sale ends.

Edit: Similar to the "Daedalic bug": https://www.steamgifts.com/discussion/yq8ow/daedalics-games-giving-100-points-here-on-steam-gifts-wtf

Thanks for bringing this up.I could never understand why my Won GAs increased even though I stopped participating in games.

And it's back to normal (or at least it's back up for a few games). Lego Movies 2 game is back from 50P to 30P, but the Steam bundle is still there.