Invoices automatically including Sales Tax

If I enter a product, and set the sale price as $100.00, when I select that product for a sales invoice, it automatically calculates as $100.00 taxes included (reducing the price/rate to $92.00 without tax). But I would like it to be $100.00 plus PST and GST totalling $112.00 in BC.

To make things even more strange. When I create an invoice with my iPad, the same product is calculated properly as $100.00 plus taxes as I would like (Totalling $112.00)

But if I write an invoice from my iPad and one from my desktop, using the same product from inventory:

Desktop:

Total: $100.00 including GST and PST

iPad:

Total: $112.00 including GST and PST

Please assist

Thanks Nick