1) You didn't connect the macro to the button, so no worries there, easy fix, yes?
2) Your column C "empty" cells aren't really empty, are they? Some sort of null characters in there? Do you know why that is? If you can simply clear those cells properly, the issue goes away.
3) I have added a routine to the beginning of this macro to sift through your column C values and remove these weird null values, then do your sort.
The macro is fine to use, but it's really best to analyze your work process and see if you can spot where the weird null values are being added into your sheets and try and solve it from there.
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