Spell Damage Rolls Twice; Don't know how to stop it

I'm setting up character sheets in Roll20 for D&D 5th Edition. I set up the Sacred Flame spell, and when I click on the spell attack it always rolls the damage twice and takes the lowest but I have no idea why. I have it set to only rolling 1d8 damage, but I can't stop it from rolling 2d8 and taking the highest.

You'll need to post your code, if you've set it up yourself - or even better, a screenshot of the spell settings. If you're using the PHB version, just delete it and drag & drop a new one. I've just tested it and it's working fine. I've no idea how the Compendium version would end up with a kh1 or kl1 operator in a damage field. On second thoughts... isn't this an SRD spell? You should be able to drag & drop even if you don't own the PHB.