Invoice showing same price for inc and ex tax

[robsnowden]

** BUMP **

Sorry to bump but this is really causing an issue as my customers are confused by the way the invoice details each product:

As the attached image show, the figure (exc VAT) is the same as the figure (inc VAT) which is not right of course. The VAT is shown ok at the total and the calculations are done ok but I am at a loss to work out why the nett and gross figures per item are the same. I guess it must be the way I have the site configured but.......

Any help gratefully received as always.

Thanks

Rob

PS Incidentally you will see that I am using a shipping mod but this is not the reason for the problem as it was like this before the mod was installed.