level decreased

Yes it is.

Yes. You got a temporary boost in CV that was set back to the correct values now.
It will happen every now and then.

Any time multiple packages are listed on the same store page, it'll list the cheapest package first [and thus, send that data out to SG when SG asks for pricing from that store page].
Thus, when a $100 package goes on sale for $12, and it's cheaper than the $15 base game listed on that page, SG will temporarily report a much higher value for the game.
When the game goes back off sale, it'll of course revert to the correct value.

Flip side of this, Free Play Weekends will report a temporary value of $0, as the no-cost Free Play Activation takes priority on the store page.

Yes, you giveaway to many The Whispered World Special Edition, and their price fixed.)

Yup happened to me too. I'm curious which game iy was with me, but I'm also really happy because it landed me exactly at 5.00 instead of bringing me down to 4!