SEN0542 (UART fingerprint sensor )1:N search working for 1 user, but failing for different persons

I tried enroll with different fingerprints and it worked. I also got 1:N compare(search ) success for all registered fingerprints, but when different people other than me , try to enroll and compare, enroll works and fingerprint is registered, but 1:N search fails for other users. Is it because of physical parameters like moist or dirt in hand? or some coding part changes is to be done, please let me know.

Thank You