What's up with all the $99 games with a 95+% discount on Steam?

So I was browsing SteamDB.info looking at the various games on sale when I noticed there were a bunch of games (usually from the publisher Hede, but there's quite a few others) listed as having a discount in the high nineties, yet still costing in the neighborhood of 30-50 dollars. Even odder when I go to the game's Steam, it's not listed as being on sale and costs the... "normal" price of $99.99.

I'm just wondering A) What the scam is here, B) How a SteamDB.info is getting $99.99 dollar game as costing 30-ish dollars when it's 97% off but at the same time it's apparently not actually on sale?