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Hi Barry, thank you for your response, but I did not manually insert any row. I have gone through the steps multiple times with the same outcome and I have never moved or inserted any row. When I first found this problem it was on a bigger spreadsheet where I use a VBA macro that I wrote to automate this process. I spent several hours recreating the problem with a very small dataset. I find it interesting that it works correctly with 4 columns of data for each month but then breaks with 5.