A thought, are you trying to use a smart phone or tablet to make the payment as some sites do not work as expected on these devices, browsers on these devices use the 'mobile site' which renders the screen to be more viewable on a smaller screen.
The way around this feature, when using a smart phone or tablet viewing the payment page change the browser to use desktop site.
For google chrome (similar for other browsers) click on the three dots top right corner and select 'Desktop site' in the drop down, the text may get smaller.
The other option would be to use a PC.
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
