Less pension amt received from EPFO

I attained 58 yrs on 31.03 2019 and receiving pension under EPS 95.
My DOB : 21.03.1961
My DOJ of service : 05.11 1987
My retirement date : 31.03.2019
My past service prior to 15.11.95 - 8 Yrs
NCP - Nil
Pensionalbe service : 23 yrs
Bonus yeras : 2
Total pensionable service : 25 yrs
As per the XLs sheet appearing in this forum ( attached the calculation) my calculated pension amt is as beow:
Pension for past service: Rs 519
Pension as per EPS 95 : 5054
Total pension: 5573
However, I get only Rs 3370 from EPFO
I wrote to RO, Chennai RPFC
No reply received so far
Can anyone explain why I get less pension than the calculated amt.
Parameswaran