Ok, have updated. but the issue is still there. Adding it manually here, se screenshoot. (I have an extra plugin that just show the price including tax for checking)
You could try adding 2 of that product here https://naturi.no/product/oveg-standard/ and you will see that the calculation is right 378,10 and wrong on backend still 398 as if tired pricing is not there. Just look away from shippingcost ofc
The tax is added extra instead of withdrawn when recalculate is pressed. I would love that this was an option I could turn on. I have premium.