Taxes seems to be rounded to nearest integer

I have configured MarketPress to use the Swedish value added taxes of 25 %. For an order of say SEK 2.00 that would give a tax of SEK 0.50 and a total sum of SEK 2.50. But MarketPress shows it as SEK 3.00. Is there a way to get MarketPress to behave correctly?

Screenshot of order status page:

Screenshot of MarketPress settings: