Hello,
Take our apologies for the delay in answering. It’s related to the number of requests during the weekend.
1) I checked the add to cart and remove from cart option and don’t see the problem. Could you, please, provide us with video of the issue for better understanding?
2) There is pagination on the shop page https://gyazo.com/29e5ac9eff8c0a027cdeb107e795adae
3) Issue with the Quick View is related to Elementor js error https://gyazo.com/e438b7a80a7018487245ed66f4c45daa that caused by this option https://gyazo.com/b6de3a042aeb2e725e989d34e642bb12 Don’t enable it because it’s Alfa and generates js errors as you can see.
Regards