Could you please share any screenshots or a sample workbook.
The image is not so clear. Anyways try to check if the date filter that is showing up is coming from a different worksheet.
Or remove that date filter from the dashboard completely and make the filter out of the worksheet that you want to use.
i remove the date filter that shows up.. i save and close the workbook, it shows up again... i dont see any other filter on other sheets that shares this filter
The date filter that is on dashboard, might be trying to add a new filter in the worksheet level which is causing it to disappear.
Remove the new filter from the worksheet.
Remove the Filter from the dashboard level.
Check both the workbooks are sharing only one date filter.
Now from the dashboard click on the small arrow on worksheet and try to add the specific filter.
Hope it fixes the issue.