Tax is not working correctly

-- HikaShop version -- : 2.3.0
-- Joomla version -- : 3.2

Hello,

I am trying to work out taxes. Once installing, I set them to 21% VAT.

What happens, is once I try to add a price to a product, I see that the VAT% added to price is lower than it should be.

When I enter "Price with tax" 15 it says that "Price" is 12.39 when it should be 11.85. What am I doing wrong? I can't seem to find the problem.

Must have been working too much... Just did some math and realised that it is working correctly