Why Contributor Level decreased from 1.9 to 1.3?

if I understand correctly, you did recalculation because of bundle

CV always goes down. I was level 9 for 50 times and always slip back to 8 when 2-3 games I gave earlier get price reduction or whatever. Ignore it and give more, that helps to satisfy the hunger games.

Because some bundled games where still counted as unbundled until yesterday.

To sum up what others already said:

1. you drop in lvl because games that where bundled werent entered in the system yet, this can happen even after months that the bundle came out. The reason of this is because there is only one person to edit this part of the system and outside bundles that person has to alos monitor sales prices of games because if they drop anywhere in the world lower then 95% of the US steam store value, they are considered bundled as well.
2. The normal price of the game (without the sales discount) has dropped. Steamgifts uses the US store prices, so if they drop there, your GA's will drop as well, it doesnt matter if the GA was made before or after the drop.

I think the game Memoria is at fault.
Isn't it one of those games that frequently gets boosted to 100P due to its valor being counted as a whole steam bundle while on sale?
Maybe this weights on CV too?