Help with a potion effect bug

Hey,

i have no idea why, but for some reason when i try to give someone potion effects through a procedure, the effect is always one level above instead of the specified one. I find it really annoying, because i wanted to make an item which will give you a steady regeneration, meaning regen 1, but instead it gives 2 even when i write 1 or 0 in the procedure block.
Please help.. im desperate, im confused more than ever.