An integrity check might fix the problem, it just depends on what's actually going on. This would be easier to for someone to handle by phone/remote support rather than trying to address all the possibilities in a post.

thank you, I did actually talk to Sage & the problem has been resolved. It stemmed from the computer shutting down causing a lot of errors (not just sage). Somehow a bunch of transactions had disappeared from the system on the day that the computer crashed. After the computer was repaired & I logged into my PayPal account to process some orders I discovered my PayPal account showed I had a lot more money in it than Sage showed. I compared transactions & discovered that all the transactions from the day of the computer crash had disappeared. Once I manually input all the transactions from the day of the crash the assemblies quantity matched matched actual quantity in the inventory.

It was weird that all those transactions just disappeared. I had printed the invoices & had invoice numbers associated with them but they were someone off in the cloud.....& not even in a backup because they were processed before the crash happened & by the time the computer cooled down & I was able to turn it back on they were gone. I'm just glad I backup on a thumb drive ;)