Hi,
I think you have save your configuration which has re-store the right value of the currency in your database.
I guess that one wrong currency was saved and, because the currency was unpublished, you saw the CAD in the dropdown.
Good news that your problem is solved
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.