Why is margin blocked showing is more than that should be blocked according to span calc


I hv bought one lot of nifty futures at 8676 and one lot 8700 put at 126. Margin blocked in my limit report is showing 13020. But for this very trade total margin required in span calc was around 9800. I checked it just before and after the trade as well. Will rest of benefit be given in EOD? I placed these order separately by calling in single call only and not through spread window. Is that the reason.

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