At the money its always equal.
Can you please check 19000 ce or more and 18000 pe or less
75k for 18k pe and 79k change for 19k ce
I think it’s reasonable
Margin requirements are dynamic, they keep changing.
If you have a net short position and the market is moving against you, the margin requirements will go up. and if the market is going in your favour the requirements will come down.
It is a disguised but effective safety mechanism to help you exit the losing position.
Nothing alarming for a net long position though.