If you've just added new products to SellerExpress and they've been uploaded to Amazon - sometimes they can list at an inflated price initially.
This is often because products can be uploaded to Amazon before they have been priced with the Auto pricing tool. Check your auto pricing tool schedule via the Amazon settings screen on the Settings menu.
For more information on Amazon pricing - see the help on marketplace section of the product screen in SellerExpress.
If you have just added a new marketplace your prices will be listed at an inflated value to avoid any products selling too cheaply before the Pricing Tool has had a chance to do it's job. If you notice this let the Pricing Tool run, if products still list at this inflated value let firstname.lastname@example.org know.