We have attempted this particular oatmeal stout twice…both times we missed our target gravity by quite a bit. I’m wondering why?

We are still pretty new to homebrewing, so still trying to get all the proportions right. However we modeled this particular recipe after a kit we purchased.

I’m curious what causes a beer to miss the gravity target? In this case, our target was 1.050 - 1.058

Our actual gravity turned out to be 1.038…which means our ABV will be less than 3%

Thanks.