To build on and further explain what Andreas is describing: The alien sheet has a roll template, which includes code to show the roll results in chat. Because of the way aliens works, and the limitations of the roll20 dice system, each Alien roll has to send over 20 dice to chat, to account for the base roll, and any stress that might be rolled. The roll template then intercepts those dice, and decides which to show and which to hide. The problem is, the 3d system doesnt know how roll templates work, and just displays all dice in the button roll. So the value show in chat is correct, but the 3d arent. This isn't a bug, strictly speaking. It's the fact that two features of roll20 (the 3d dice, and the rolltemplate system) are completely independent, and work differently. So those systems that need convoluted rolltemplates to work properly on roll20, generally don't work with 3d dice and it can be often better to just disable that feature to stop it being distracting.