Huge price differences in Swiggy and Zomato food menu.

I've recently noticed this. I was planning to order from Machali. The price in the Swiggy menu for an item was Rs. 110 and when I select it to add to cart, it was Rs. 140. But when I went to check in Zomato, they were charging Rs. 110 for the same item. I also browsed the menu of Maya Lunch Home and a nonveg combo in Zomato whichcosts Rs. 129 is listed for Rs. 220 in Swiggy. This isn't about just one item or one restaurant. I've been seeing price variations across hotels. Swiggy prices are way higher. Has anybody felt the same? I've also noticed that if you've a Swiggy premium or a Zomato gold, you don't get coupons which other customer who use the basic version get. The prices for gold are also slightly higher.