The CCS Staffing report is (I believe) your "true" system seniority, "moved up" by any LTAs or other Leaves of Absence.
Once or twice, I've seen my seniority slip by a few numbers.....assuming it was because someone came back.
You can find "seniority" on the staffing page, vacancy bidding, displacement bidding, and PBS....the only two that are the same or very close are staffing and PBS.
This link is useful for the published system number, but doesn't take leaves into account.
Untitled Document