I believe that the Projected Feb16 list is using seniority numbers from the original AE bid the list is based on; in this case 10Mar15. It would make sense that the seniority numbers on the Actual Category list for Sep15 (actually posted 03Aug15, probably using Aug15 seniority numbers) would be different in what looks like a negative direction.

IOW, you can't compare seniority numbers directly between the two lists, because they are using two different base months.