Hi there! To complete tasks you need to put proper dice on top of the card. The bug with broken dice only happens when you complete the task by picking dice up (for example if you had a card that required a sum of 7 and dice with values of 4, 3 and 5 on top of it and then picked up a 5), it's a rare situation, you don't really have to worry about it.
If you're still interested in figuring the game out we have just uploaded a gameplay trailer on our itch page from which you can learn the rules.
In any case thanks a lot for playing!