Coupons Problem

Hi Sir, I am managing a multi vendor website using WCFM Ultimate and OceanWP as Theme. Today I tried creating and applying Coupon Code on one of my Product. It was applied successfully and was showing correct amount till checkout page. When I clicked on Pay button, it asks to pay full amount excluding coupon. I am using PayU Money Plugin & Paytm Official Plugin as payment method.

I also tried disabling all other plugins, but it didn’t helped.

Please let me know if it is due to theme or due to some other plugin.

Thank you