Option chain regarding change of OI

Hello friends , there is confusion in option chain that if there is 520 no. of open interest held in a certain strike price on the day it’s trading and change of open interest is - 4200 on the end of day at 15:30 hrs and the change of premium is negative so my question is how Change of OI can be negative as compared to 520.

On the previous trading day the closing open interest was 4720 i.e. 4200+520, so there is a decrease of 4200. Hence it says -4200 as change in OI