^Adding to this: When not summarized, it shows the correct total.

I'm not sure I understand what you are going for. However, some of your results are for the same sku, so it gets added to the total more than once. Count = the number of results. SUM adds up the number of each result line. If your search results multiple result lines for the same record/item, you will receive a different result

There is only 1 line for each result. Each record only shows once as I am strictly using the name field which is unique for each item. When not using grouping or SUM, it shows the correct total, however when grouped and using SUM, it somehow calculates additional values to add to the SUM. -- There are no drill down fields in the search either.