Did this happen again if you deleted from the journal and then added it again from the Compendium? Did you make sure you had the Compendiums enabled in the specific game? It sounds like this isn't the case, and you only have access to the free SRD compendium. Can you provide screenshots of the monsters that doesn't work? Can you provide more examples of both monsters that work and doesn't work? Is this a newly created game with no old stats and characters? I think in some rare cases when you have old SRD version of monsters in your journal, it might cause troubles when drag-n-drop new monsters. Mad King Christopher said: I've bought the 5E compendium set, DMG, Players Handbook, and Monster Manuel. Further note, the DMG isn't purchasable on Roll20 yet , so the bundle you bought is likely the DM Bundle , which has the Essential Kit as it's third item.