While this imprecise rounding scale may be part of the problem, I think the bigger problem here is your unfamiliarity with math/weight.

Assuming you got .2 oz's not .25 oz's you lost more than a gram..... not a "granule". Then again if you don't know what grams are.... well for comparison, it's like losing a pretty good joint's worth.

You might want to first just go to wikipedia and read about grams, ounces and pounds and how those all fit together, get all that straight in your head before proceeding.