volume discounts and order bumps are not working correctly.

On shops with a different currency (e.g. the Polish shop), volume discounts and order bumps are not working correctly.

Details:

Volume discounts:

When a discount tier is reached (e.g. 32 pieces), the price increases drastically instead of applying the discount.

Example: price goes from 4.46 zł to 17.44 zł per piece (about x4.5 higher).

On the original Dutch shop this works fine. https://stoeldopshop.nl/

Order bumps (checkout upsell):

The price is also much higher than intended.

Example: original deal €5.75 → on the Polish shop converted to €24.40.

This shows the same incorrect ratio as with the volume discounts.

Impact:
Instead of receiving a discount, customers see much higher prices, making products unaffordable and causing potential order drop-offs.

Request:
Could you please investigate why this issue occurs with different currencies and how we can fix it permanently?