[Plugin: WordPress Simple Ecommerce Shopping Cart Plugin- Sell products through Paypal] Wrong subtot

send me your site address ( URL).

https://oyvind-danielsen.com/?page_id=1195/

I also discovered another problem. When I press “proceed to checkout” nothing happens.

It seems like your whole site has Java script issue. These are all signs of java script not working properly. What you are telling me are basic things which works for almost everyone.
Could you please uninstall all other plugins from your site.
Let me know how u go after that.
Thanks
Niaz

I’ve uninstalled all other plugins and tried with other themes(twenty ten, twenty eleven), but still same issue. Any idea what wrong?

do you mind giving me your admin access…..email me please.
on [email protected]

Thanks
Niaz