Collectible Card Game Headquarters

Hello
I'm not sure if this is a bug or just normal game mechanics so I will not use a "report-a-bug" template.
Anyway, I'm playing quest mode and the shops have fewer and fewer cards as I progress through levels. When I had just started, a shop in every world had like 5-6 rares/mythics. Now, they only have like 2 rares. I have tried exiting and restarting the program, as well as playing numerous duels/challanges, it doesn't change anything.
Thanx in advance

This isn't a bug. The game starts with something like 4 boosters worth of cards in the card shop, this is to allow you to pick up cards to fill out your deck early on and make it more stable. This number decreases to a minimum of 2 boosters in the shop in the early game, but as you continue to play the number increases to a maximum of like 8. This was to add a little bit of a challenge a bit earlier in the game, where the AI decks aren't so strong. Just keep playing, it'll move back up soon enough.

(These numbers may be a bit off because I haven't looked in the code in a while, but it's something similar to that.)