Hastings College does not include pluses and minuses in its calculation of your GPA. A B+, B and B- are all worth 3 points.
However, the the Law School Data Assembly Service recomputes the Hastings College GPA (and GPAs from any other school that does it this way). So a B+ is 3.33, a B is 3, and a B- is a 2.67.
So if you have a 4.0 from HC but you have an A-, that pulls the 4.0 down. On the flip side, if you have many B+?s, your GPA will come up.
Here is the full scale: