Custom Pricing has an extensive installation and while on the Draft Orders or Accelerated Draft Orders Method, the app uses a draft order to apply discounts to products on your storefront.
If other apps are installed on your store that also requires the use of a draft order to apply discounts in the checkout or modifies prices on the storefront, this can cause issues while using Custom Pricing and the third party app at the same time.
To resolve the conflict between Custom Pricing and the third party app, one of the two apps would need to be removed, along with the liquid code, from your store.
Please reach out to the third party app's support team for assistance with removing the liquid code from your theme.
For a list of some third party apps that we have come across often that have a conflict with Custom Pricing and the reason, please see the table below.