Hi Matt,

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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You are right, it is due to whole numbers as part of the Header Names.

Currently, there's a bug with Conditional Formatting and Calculation Functions 

when it comes to using whole numbers in the headers. 

Workaround is to edit the source file and change the header of a column from "1", "2", "3", etc,

 to "One", "Two", "Three", etc. 

and then modify the display header. 

In the Column settings/Display/displayed Header you can then input anything you need with the numbers.

It is just important to keep the 'origin Header' without whole numbers.

Our developers isolated the bug, and they'll add it to their queue for fixing.

 They will do their best to build a fix as soon as possible.

 We don't have an ETA on when the fix will be available, but please keep a lookout on our wpDataTables changeLog.

It will be stated there during updates which bug fixes have been implemented at each update.

Let me know if that helps.

Thank you.