Edit Orders doesn't add VAT to postage, therefore breaks every order that is edited

Hi All,

Whenever I edit an order using "Edit Orders" it reduces the total by the exact amount of VAT due on the postage, and it reduces the VAT amount by this same amount as well.

So every time one of my colleagues goes to edit someone's address or something I have to go into the database and correct the totals back to how they were (from the order confirmation email/ the total from Paypal/NoChex).

This wasn't an issue when we weren't VAT registered, or for the couple of weeks when we were incorrectly not charging VAT on postage, but now we're correctly charging VAT on postage its a real issue.

I wonder if anyone could help me track it down and correct it please? Perhaps someone who is familiar with how this add on works.

Many thanks in advance

Simon