Student View of Gradebook shows entries for groups not a member of

To reproduce:

Requires: Assignments, Gradebook and at least 4 students

1) Create 2 groups and 4 students. Add one student to both groups, another student only to group 1, another student only to group 2, and one student to neither group.

2) Create 4 assignments - one assignments for all students, one assignment for group 1 only, one assignment for group 2 only, one assignment for both groups. Set points for every assignment and every assignment should be added to gradebook.

3) Log into Sakai as each student. Click on Gradebook. You will notice that every student sees gradebook entries for all of the assignments. Assignments tool shows the correct assignments and hides correct assignments.

NB: Student cannot take the assignment from groups for which they are not members and therefore gradebook calculations are fine.

Screenshot gradebook_screenshot_stu1 shows student 1, who is only in group 1, showing gradebook entries for Asn both groups, which is incorrect, and Asn Group 2, which is incorrect. 

Likewise student 2, who is only in group 2 is shows gradebook entries for group 1 and both. And student 4 who is not in any groups shows gradebook entries for assignment group 1, group 2, and both though not in any group.

In the screenshot I have categories with weighting but I tested without weighting and get the same results.