Seniority List of Inspector RPF

 

I would like to know how seniority list of Inspector RPF is prepared?
What are the criteria, considerations used. 
 
As the name suggests, it is seniority list of Inspector RPF, which 
looks like seniority of Inspectors. But when i checked the list which
is recently uploaded on RPF website i was suprised to see the seniority 
order. 
 
The first 53 employees ( or senior most 53) are promoted as inspector 
from 1994 to 1997. But 54th onward are the one who got promoted much earlier
starting from 1983. So it is difficult to understand how employees 
who are promoted as Inspector on 1983 ( eg, 54th ) is junior inspector 
to employee who promoted on 1994 ( 1st ) ?
 
As the list grows, you can find this often. Many Inspector who got
promoted earlier should be senior but are in bottom of list. 
Can someone please explain this? precisely for first 53 Inspectors
who are much junior to other Inspector but kept at the top of list?
Link to download Senioritly list of Inspector RPF uploaded at RPF website-

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