Actually, the filter is set at the sheet level. Edit the sheet. See what filters are on the filter shelf.
But there could be one more thing: A data source filter. When editing a sheet, right click on the data source. Select "Edit Data Source Filters". If the ensuing dialog box is blank, there are no data source filters. But if any are there, that might be what you are looking for.
I have now resolved the issue – removing filters 1 at a time.
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