I've seen this happen a lot on columns using multi-value fields, or if there's a complex SQL string as the form's RecordSource. The filtering option isnt turned off, it's just not returning any of the column values when you click the headers, correct?
If the form's RecordSource is a SQL string, try taking that string and creating a new query with it. Save the query, and set the form's RecordSource to that query instead. Normally it wouldnt change anything, but split forms are very strange and I've found this solution works most of the time.
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