I am using WPML which is compatible with WP Hotel Booking plugin. My issue is I couldn’t search any room when I am inside the Chinese website. English works perfectly fine. Link to the search website: https://rickresort.com/hotel-rooms/?lang=zh-hans
In the instruction, one of steps to setup multilingual is translating Room Capacities http://prntscr.com/llhkmt. But you didn’t translate room capacities yet. This is one the reasons makes the rooms not work in Chinese. Please translate the room capacities firstly.