currency selection in plugin settings not reflected in paypal

I have the currency in the fundraising plugin set to "Canada, Dollars - $" but if I try to donate $1 CAD then paypal tells me "Total: $1.00USD"
Is this a problem with paypal or is there a setting somewhere else in the plugin that I missed?
Is anybody else seeing this problem?

Our donation page is at http://gwmfoundation.com/donations/donate-now/ if anybody else wants to test it.

Any suggestions would be appreciated