The NPC sprite framerects (that is, the positions on the spritesheets - the things Booster's Lab needs) are in the code of said NPCs. npc.tbl just defines hitboxes & display offset.
Now consider ASM hacks... and things go horribly wrong :(
Most people probably don't realise this, but this forum has had two editors for a number of years. One is the xenForo default editor, and the other is a custom editor I made years back I called BBCEd.
All the settings for which editor you use was lost during the upgrade. You can find the setting under Account Settings > Preferences > Editor.