Hello Johan,
Thanks for reaching out to us! Let me try to help you solve this mystery. :o)
To be able to give you better support, please share your system information with me. Thanks!
You say:
All settings everywhere is set to show prices including VAT.
Can you let me know what settings are we exactly talking about? What eCommerce plugin are you using? WooCommerce or Easy Digital Downloads?
Can you please send me screenshots of the VAT settings?
Thanks and looking forward to helping you with this.
Cheers,
Andras