Both games have already had a similar discount, according to SteamDB.If I remember correctly its a consequence of a regulation.
The -10% is probably the first reduction. I think the one with the % needs to show prior reductions. So its probably not the highest reduction the game has.
Curiously,
- Display the price of the product or service alongside the discounted price, showing the lowest price it has been for the previous 30 days.