Booking Now button keeps on loading

Booking now button keep on loading when I have a product in my Cart. When I refresh my browser, the hotel room I try to add, will automatically add to my cart.

See screenshot for reference.
Before I book for another hotel my cart is like this —-> http://prntscr.com/ii3xjd
When I click Booking Now button —-> http://prntscr.com/ii3y7i
When I refresh my browser, it will look like this —> http://prntscr.com/ii3yvu