With mobile can't get payment page

I am using PayPal donation button where there is choice of PayPal or credit card.Everything works fine when using my desktop or Surface Tablet.When using my mobile (windows phone), I cannot get the PayPal payment page which gives me the options I want. Instead I get redirected to a PayPal log in page which does not give the credit card options. Can only pay by PayPal.
It looks to me as if there is a redirect for mobiles.
Any comments would be helpful.

Site URL https://www.bishopstownhillwalkingfestival.net/

John Coughlan

https://www.ads-software.com/plugins/paypal-donation-button/