So, in the past when I've made a 5 gal. batch from a kit, I would follow the directions, do a partial boil, and add water in the end to bring it up to 5 gal.
Then I bought a refractometer.
So now when I'm adding my water, I bring it up to the target OG, not the target volume.
I assume it's better for my fermenting and abv calculations.
Now I've had the same thing happen in my first two brews using this idea. Both times I've added water to bring it up to the OG, but it's closer to 4 gal. than 5 gal.
Is this normal? Is this okay? Is this fixable?