Hi Jesse,
Here is a link to Pivot Table Limits and I don't think you are even close to a limit.
http://support.microsoft.com/kb/211517?wa=wsignin1.0
More likely is you have a blank column on or about column 23. You also need different column names at the top of each column. If you have two that are exactly the same, Excel has a problem with that. Or perhaps you have a Merged Cell in the column heads that is causing the problem.
I also have a problem with the version of Excel you claim to have, as your profile says "Excel 2015". Are you using Excel? What version is it as I don't think there is a "2015" version.
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