Not sure how this has happened, but we have an invoice that has doubled a line item. 

Sage Advanced 2018 6.00.3.0

The problem also is, it does not show up in the Lines tab, only the Totals tab, or when the invoice is printed. Our system seems to have only taken one of the line items and doubles the dollars sold. 

The invoice has two lines entered.

line 1. total is $1115.50

line 2. total is $9.60

Totals tab shows $2240.60

Added exactly an extra $1115.50

If you erase both entry lines and show a zero balance invoice, it still shows the extra $1115.50 in the totals tab, with no lines entered on the invoice?

We ended up deleting the invoice and re-entering it into a new SO#, and it worked fine with no errors. 

But does anyone have an idea as to why it did this? We seem to see it on our end once a month or so?