I've noticed the Level doesn't update to the new value, but these elements seem to work correctly: Increase the creature’s level by 1; if the creature is level –1 or 0, instead increase its level by 2. Increase the creature’s AC, attack modifiers, DCs, saving throws, Perception, and skill modifiers by 2. Increase the damage of its Strikes and other offensive abilities by 2. If the creature has limits on how many times or how often it can use an ability (such as a spellcaster’s spells or a dragon’s breath), increase the damage by 4 instead. Increase the creature’s Hit Points based on its starting level (see the table below). Have you checked whether it works correctly with the sheet popped out vs not popped out? Tried different browsers (I use Edge for Roll20)? Which compendium are you using? I used Monster Core just now to test.