I don't think I fully understand the problem.
In the file ExcelForum DateRangeArrays_3, sheet Activity cell C12, "Plant down" is returned which you say is incorrect. What should be returned then?
If I look at the same row in file Forum_Test I can see that your SUMPRODUCT function in AT12 returns 3 which is the same as my SUMPRODUCT function returns (ExcelForum DateRangeArrays_3, sheet Activity cell C12).
Can you please try again to explain exactly what determines which text should be returned.
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