Update: This is a Panda theme issue.
Problem:
I have a product with a combination. The price for 1x is 10 incl. taxes. This is displayed correctly.
Starting at 5x the price is set as 9 incl. taxes. It should show 9 incl. taxes (which would be 8 excl. taxes). However, it shows 8 excl. taxes.
It's misleading for customers, understandably.