Sage 50 Canada

My starting balance is incorrect in my remittance summary. I tried to adjust the payments part so it would zero it out but it didn't clear it out. How can I get it removed or adjusted?

I have entered my HST Tax under Setup → Settings → Company → Sales Tax with Tax Code rate of "13" for 13 percent, however, when I enter an invoice in the purchasing module it is calculating the tax at 11.5 percent. Can someone tell me how to correct this…