GST on invoices is calculating twice on items

Hi Guys
Im having a problem on my new reckon hosted 2017.
When I create an invoice the GST seems to be calculating twice in the item amount total. Yet the Total of the invoice has the GST added once. So it wont send or save as out of balance.
Checked Tax Item list and Tax code list and everything seems to be in order. I had two accountants log in today also and they were perplexed. One even laughed.
Tried calling Reckon tech support ten times today. Went to hold every time for exactly 30mins and 30secs then it hang ups. I then rang customer service. She said we cant help you ring tech support. I said Ive tried that and doesnt work. She said well I cant help you.
My accountant tells me why arent you on Xero..... I said hmmm yeah Im starting to wonder myself as customer service at Reckon doesnt seem very good at all and it appears I have a gliche in their software.

Frustrated as Im a small business and I cant get invoices out.

Hoping someone has had this problem too and found an answer???

Cheers!
Andrew