Hi Mindless Calm! I am assuming you are using the D&D 5th Edition by Roll20 Sheet. This answer may not help if something else is the case. Are these fresh compendium drags of monster which do not yet exist in your game? That would be a less common issue. The most common cause is setting up a default token on a page that does not have a cell width of 1. Check your page settings, if necessary, create such a page. Drag out your misbehaving monster on that page, size it properly, and then save that as the default token for the monster. It should come out properly scaled to whatever page scale you have set elsewhere.
