The stock import appears to be way out on SAGE 200 - the opening and closing nominal balances on the stock code agree but the report is about 6.5 mill adrift.
I recommend checking the Sage website where you can see all the information related to stock importing and available functions. The issue you're having is nowhere described or explained, therefore it's impossible to say what needs to be done in the software. It it's installed on your PC, access the built-in Help section as well.