Confused about m2m loss in option selling

[Stonecold]

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MTM Margin calculations in options spreads

I have Bull Put Spread which is Deep ITM now and hence in loss. I observed today that as market continued to fell, and as my loss in sold PE increased gradually ( profit in Long PE also increased proportionally), Zerodha started blocking more and more margins. In the past I have been mostly able to avoid such large move days and haven’t experienced this before. So even though net PnL for spread remained constant my Margins kept increasing. Why? Mechanism explaination plz. 2, What will happ…