Am I just stupid?

I have been buying the half-gallon resin/hardener sets for a while and have always ended up with too much resin and not enough hardener when getting to the end of the jugs, forcing me to start a fresh set. (And before anyone @'s me, I have experimented with mixing brands for some truly horrific results.)

For giggles, I decided to weigh my unopened Teexpert part a/b combo and have vastly different amounts.

The hardener comes in at 2084mL and the resin comes in at 2294mL.

This is supposed to be equal parts A and B, so you would think that the measurements in the bottles would be somewhat equal... or am I just being stupid.

Advice would be greatly appreciated if I am doing this completely wrong or if anyone else is having the same problem.

Edit: So, it really is that I am an idiot that can't read. The user guide (which I had to dig out of the recycling) does mention volume rather than weight as a guide to measuring... which has been the cause of my frustration.

Many MASSIVE thank-yous to everyone who commented and helped!