My tier prices are set up correctly in the back end, and are applied fine in the checkout but are displayed incorrectly on the product page.
It appears that the pricing are initially correct on the product page, but some code loads and changes them.
Solved! Go to Solution.
Is this the default theme? Could you enable the default theme temporarily and see if the same levels show. That is a bit strange that it would show incorrectly there but correctly at the cart stage.
It does seem unlikely that it's theme related but it's one thing to check.
You can temporarily apply a design change using: http://docs.magento.com/m1/ee/user_guide/design/theme-scheduling-changes.html