Which PO value is picked in Purchase Order Release Strategy?

I have one query-

My Material Cost PBxx is 5000/-

My VAT/any tax ZBNQ is 500/-

Suppose I have set up Rel Strategy as PO value less than or equal to 5000/- R1 and Po value greater than 5000/- as R2, the system is showing me as R1 instead of r2.

What to do in this case?