Noibu tracks revenue loss based on whatever currency your eCommerce website uses. However, the currency marker does not update by locale, and totals are always displayed using the $ currency marker. This is a known issue.
Rest assured that any totals you see are in your local currency. For example, if an issue on a website in the UK results in £50,000 of Annualized Revenue Loss/ARLdef, Noibu will record the issue's ARL as $50,000. Despite what the currency marker indicates, the total is in GBP, not CAD.