My monk unarmed strikes don't show the dice.

My unarmed strikes on my monk only show the damage as the strength total, not the dice to use, that being said, my monk is 12 monk 4 barbarian. 

As part of your levels in barbarian, are you wearing any armor, wielding a shield, or using a weapon that's not a monk weapon?

The section on Martial Arts specifically mentions this:

You gain the following benefits while you are unarmed or wielding only monk weapons and you aren’t wearing armor or wielding a shield:

If you're using any of the above items, Beyond would likely automatically disable the unarmed strikes application of Martial Arts