We suggest you change a device or browser and try again. Sometimes certain aspects of checkout won't display or function properly.
And you are suggested to try and check out using PayPal express check out to see if that helps.
If you're still having trouble, you can give us the SKU, quantity, color, and size you need, and we will send you a payment link for you to pay.
And you can also call our US office to pay via the phone.
Here is the phone service:
TEL: +1 323 435 4812
from 9:00 am to 6:30 pm PST (Monday to Friday)
If you're still having trouble, please feel free to contact our email firstname.lastname@example.org and let us know in details and we'll investigate further.