Pricing not reflecting correctly in checkout or cart
If you notice that the discounted price is not reflecting after you add items in the cart or during checkout, this can be one of the following issues:
Other Upsells apps can stop our Discounted Upsells app to behave correctly, so we suggest not having other upsell apps installed in tangent with our app. If you still decide to have other upsell apps installed, then we can offer minimal troubleshooting to resolve any issues that may come up. The types of unsupported apps can be found here.
When you use a currency converter that is unsupported, the prices of the discount can either not apply or show up incorrectly. You can read more about using currency converters here.
About 90% of themes can be used straight away, but there's the 10% which requires a further look. If you have checked the above two fixes and you're still experiencing the problem, then it will most likely be theme related.