Wrong Calculation when product have included VAT.

Hello team,
I am really enjoying the software. I have notice issue before but now i realised what is wrong.
we are renting out rooms and in price 7% VAT is already included. I have set in Taxes section VAT 7% included.
So now forexample; if i select a Room for one Night 100Euro the end price is 100Euro. But somehow it is calculating wrong 7% tax. it should be 7 Euro. but it is calculated 6,5Euro. Whats is wrong there ? or i am missing something.
thanks in advance for Help,
Hasan

This might be the type of tax item you've defined. I know I had problems early on and finally discovered that there are different tax calculations in the settings. one is where the tax is included in the item price and another is is additive to the item price.