Renamed primary column on one of my report to match another, now my combined report does not work

I renamed the primary column one of my smartsheet report to match another smartsheet so that I can combine the 2 reports together. Now my combined report does not recognize one of the reports and it states "Column not found" How do I correct this?
Answers
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@Melanie Woods You'll have to look through your report settings. When you select the columns button and scroll to the bottom you should see the ones that have been changed / removed. Uncheck that and reselect the right ones… then redo your grouping.
Matt Lynn
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Thank you for your comment but still cannot see the primary column on my combined report (alphabetical or at the end). Am I missing something?