You can never have too many stickers! There is nothing wrong with these stickers. Stickers are previous inventory so they're either not in the shop anymore.
Bags may also contain different sized sticker sheets.

Paper included can be matte, premium matte, or glossy. Some bags include foiled stickers

No limit on how many bags you purchase. Coupons can not be used.

Bags may contain holiday or seasonal stickers. There are no duplicates in each grab bag but buying multiple bags means there can be duplicate stickers. 

Photo shown is just an example of stickers that are similar and could be included but all bags are different.