This is because there are 2 types of haircut files. One is from clearing corporations and other one is from exchanges. We use exchange EOD Var file (NSE) which has var % comparatively lesser than the NSCCL one. Also, clearing corporations haircut has minimum haircut % criteria.
NSCCL : https://archives.nseindia.com/content/equities/APPSEC_COLLVAL_05042023.csv
NSE’s EOD Var : https://www.nseindia.com/all-reports