Hello!
Thank you for making a bug report!
In order to view materials, as of the newest update, you click on number that displays the number of materials currently attached to the card. This will show the exact materials attached to the card and no longer competes for space with the “Activate Card effect” and “Declare Attack” buttons when in the battle phase.
You can see the info on this in the new patch notes, found here: Duelists Unite
Thank you for helping to make Omega be the best that it can be.