Yes I did multiply by 0.5...

I think my reading may be incorrect because i have a defective DPD #2 dropper bottle. It's unlike any other one in the kit and I can't get a controlled drop. The drops are much smaller (1/2-1/3 the size of other bottles in the kit) and come in rapid succession. I'm not sure what to do at this point. Do I have a defective bottle?