QB adding VAT to an already vat inclusive amount

Hello

I hope someone can help.

I imported all my stock into QB from my WordPress website. All my prices are already VAT Inclusive. 

I am having an issue when I set up a quote or invoice: If i select VAT inclusive QB adds VAT to my already inclusive amount in the line item (so that the total is my price incl VAT + extra VAT), if I select VAT Exclusive it lists my correct price in the line item bu them adds VAT to the final total over. How do i change the settings so that I can simply select VAT inclusive and add the stock items without having to manually change the prices?

thanks!