It is a bug.
I got the same problem. We work with Confluence 5.4.1 and the OfficeConnector 3.1.4 or (126.96.36.199)
You are wrong: The ExcelMacro works fine and be shure, it can display column No 6.
But you have only one shot: Attach the Excel to the page, configure the ExcelMacro (rows, colums, sheet) and save the page. That works fine. But ...
... you can't edit the columns, even when you delete the macro on the page. No way. You must delete the attachment, rename it and attach it again with a different name.
Since now I could not figure out where the macro configuration is cached.
Perhaps someone here can give us some tips.
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