Festival bug

During festival I am being charged twice for 1 round of play. 1/15 2/15 /4/15 6/15 8/15 ect. What is the problem? or is this normal after first day? I feel ripped off for this

 

You have confuse crown gain and number of fight

0/15 you see in top is the number of crown you need to gain the chest. you can see a Crown Symbol

During festival when you fight cost you food like normal fight.So for a chest you need 15 crown. So if in the first fight you have do 1 crown so 1/15. 2nd fight 1 crown so 2/15. 3rd fight 2 crown so 4/15 and so on…Battles are illimited until you reach 15 crown.

there is no bug about this