on the 5E sheet, when both 3D dice and auto roll damage/crits are enabled, duplicate damage dice are rolled on screen by 3D dice. It appears these extra dice are being rolled in case of a crit, even though the problem happens with saving throw spells that can't crit. When rolling an attack that can crit with 3D dice and auto roll damage, only standard damage dice should be rolled with the attack. If a crit happens, then roll the additional 3D dice and add to total keeping all the 3D dice on screen together. Results should show in chat only after all 3d dice rolls have completed.