Urgent help: CSS messed

Hi: somehow the description, location, review tabs are organized vertically, not horizontally as your plugin is supported to be.

Please help.

https://www.usdangdi.com/?product=san-francisco-bay-cruise-adventure

Second, it is a bug for you. When a user enter a non-numerical letter in the number of tours during the booking, the checkout page goes blank. It should not allow to enter a non-numerical character??

My IP address now: 35.163.199.70
Thanks

Sheldon