@Trader J,
This was reported many times.The data from Website to Website differs.
Within the same website at at TWO different times differ. Within the same website ,at the
same time ,in two different formats often differ.
For example , in the above ,the OI of 7550CE is shown as 1309K whereas it is shown as
in main option chain 1354K.As long as these values are in tolerable limits we can ignore
the small differences.
To be frank NSE authorities can answer it in a better way.