Clarification on PF contribution, which is a part of CTC - LOP for 5 days and salary and PF was reduced proportionately

The PF contribution is shown as a part of my CTC. I had availed LOP for 5 days and salary was reduced proportionately. Even the PF contribution was reduced proportionately depending on the days worked. [12% of Gross Salary was not considered] The details are as follows:
Description CTC Offered Salary Paid
No. of days 31.00 25.00
Basic 13,595 10,964
HRA 5,952 4,800
Special Allowance 169 136
LTA 380 306
Total 20,096 16,206
PF Contribution 1800 1,452
ESI Contribution 654 527
Monthly CTC 22,550 18,185
Please clarify if the PF contribution of Rs.1,452/- is correct.

PF contribution on Basic - 13,595 should be 1631 instead 1800/- per month. Actual earning for a particular month due to LOP Basic is 10,964 and PF contribution should be 1316 instead of 1452 as mentioned in the post.
Even adding Special allowance PF deduction will not be 1800. There is some anomaly in the data.
IF your actual Basic earning is less, PF contribution will also be less.
S K Bandyopadhyay ( Howrah, WB)
CEO-USD HR Solutions