Hey dude,
Maybe its the type of dummy you’re hitting? Some are raider’s target dummies, some are dungeoneer’s target dummies and some are normal level 60 or below target dummies. The damage you do will depend on the type of dummy you’re hitting. The higher the level the target dummy, the less damage you will do.
Try to stick with the same training dummy when working on macro’s, it’ll help you realise if the changes you’re making are having the desired effect.