MaryAnn_E,

I'm not understanding "setup of the inventory is correct", would you be more specific? 

As well as the "check each transaction on the reports to verify the quantities".  Are you suggesting I trace each transaction to ensure the quantity on the Detail report matches the individual receipt or invoice where it originated?  If you have an idea on how to break the problem down to better isolate the issue that might be doable, otherwise that would require days of work.  Or if you have a sense of which of the two reports is more accurate, I could just use the that one.

I've attached the same screen shots of the reports again here.

The Chrome incognito browser yielded the same numbers as the standard browser.