Sum up machine back to charging VAT .Follow the instruction of tapping on the icon top right go to tax then tap 0 vat save ,then it goes back to 23% VAT next fare .
How to solve it permanently .When you go into tax it will show 9,13,23% .If you tap on 23% you should see a red X if you hit the backspace on the keypad you can eliminate this permantly .Then repeat it for the other two tax rates until the screen reads 000000 for all tax rates .