webguru2 on "woocommerce multi currency"

hi there,

I have a problem regarding woocommerce multi currency switcher plugin.

plugin site url:
https://wordpress.org/plugins/woocommerce-currency-switcher/

my site url: https://www.fitneshop.dk/

when I add a item in my cart its working fine. The Header cart working fine.

If I change my currency from the currency drop down menu, the header cart currency update correctly. But after some time later it back to it's base currency.

I'm changing DKK to GBP after adding the product.

screenshots link:
before automatic update:
http://awesomescreenshot.com/0cc5yftp05

after automatic update:
http://awesomescreenshot.com/0135yfrv48

My default currency is DKK.
and I'm selecting GBP from the drop down menu.

please help me ;)