Recently, Shopify rolled out new functionality for multi-currency, allowing your customers to shop in their currency. While this is an exceptional new feature for merchants and their customers, it caused some issues within the app. Currently, the app is only able to process discounts in your shop’s currency.
In other words - at this time, multi-currency is not supported by Ultimate Special Offers. To ensure all your customers can receive your discount offers, please disable multi-currency.
We do have plans for compatibility - this is an interim solution. Stay tuned for updates about multi-currency!