Necromerger can't change values

[Ergmna]

Good afternoon !

 

I have a question about the game NecroMerger : when I try to change the values of something to buy (for example, a grave) I can't change it, it keep at 20 blue runes.

I also tried to change directly my gold coins and gems, but it seems that the game locks those values.

 

has someone managed to change those values ?

Thank you for your help in advance

[Ergmna]

Sorry, I forgot to put the link of the game, and I can't find where to edit my original post.

 

here is the link : https://play.google.com/store/search?q=necromerger&c=apps&hl=fr&gl=US