My U.K. cup sizes are 250ml.
My long time understanding is a U.S. cup is 200ml.
Is there a standard size for an Indian/Pakistani cup?
Making up some Shan special Haleem the recipes calls initially for 12 cups of water with an additional 2 later on, but elsewhere in the directions it calls for 1 cup or 175ml of ghee.

What do you guys think?

Assuming that you are working from https://www.shanfoods.com/product/recipe-mixes/haleem/shahi-haleem/, I would use for guidance the equivalence given in the masthead for oil

Being Indian you might assume the cup to be referred to is a teacup.  While some may hold 7 fl oz, the usual volume used is 6 fl oz or 177.4 ml.

If the liquid used is 12-14 cups it will make some difference. 24-28 fl oz, being somewhere more than a pint, is a lot of extra if it's not meant to be there.