A Guaranteed New Common Sticker (Left) guarantees a New Common Sticker, provided that you still have open Common Stickers to be collected.
A Guaranteed New Golden Sticker (Right), on the other hand, guarantees a New Golden Sticker, provided that you have unlocked the Golden Stickers to be collected.
There are two reasons why you may have received a duplicate instead of a new one.
- You no longer have any missing Common/Golden Stickers.
- You don't have any open Common/Golden Stickers for your current kingdom level.
Take a look at these screenshots as an example and basis:
The screenshot on the left (<-----) for Candyland shows that the set no longer has any Common cards available. Therefore, if this is the case in all your sets and you were supposed to receive a New Guaranteed Common Sticker, you will get a duplicate Common Sticker instead.
The screenshot on the right (----->) shows that the first Golden Stickers are still locked and will be unlocked at kingdoms 16 and 18 respectively. Therefore, if you are at Kingdom Level 15 and you were supposed to receive a New Guaranteed Golden Sticker, you will get a duplicate Golden Sticker instead.
We strongly recommend that you review each of your sets to check whether you have any available Stickers open to ensure that you will get a new one from a New Guaranteed Sticker.