Moodle Rubric Not adding Correctly

Hello I am using rubric for many assignments on Moodle and I am just now seeing that some of the grade totals for the rubrics are not correct. I have a rubric with 6 row and 5 columns. The point scale for each row is 1pt. , 2pts, 3, pts, 4pts, and 5pts. When I choose 4, 5, 2, 4, 4, and 5 moodle gives a total of 23 when it should be 24.

Any help??

Thanks, Andrew