If there was a glitch, my guess is it wouldn't be in the tavern, but in the guild chests. Remember this conversation:

Quote Originally Posted by Gretta_2937960 View Post
Yeah I find it amazing at how some seem to think someone must be cheating because they can use in game strategies (know when to choose a guild chest, know when to use gems, and etc) better than others ...lol
Quote Originally Posted by mattp169 View Post
Using gems better than others is a strategy.
Knowing when to choose a guild chest is not - if you actually can change what a guild chest will give you - then yes you are cheating - since what you will receive in your next guild chest and also the next few is stored server side - the only way to change it is to cheat.
As most know, you can choose what card you get from guild chests when you get one. Now, if someone could change what they get from guild chests to get a card every time (i.e., cheat), then it would result in what you are describing. A player in a level 8 guild that owns Koleton, for instance, would get 11 cards every day.

But I'm speculating a lot here. I don't think someone can actually change what a guild chest gives. And if someone can, then it's really BS.