Created attachment 132656 [details]
Demonstration of the bug
Steps to reproduce the bug:
Create in one column a short list of dates from more than one months (or years) and format it in English(UK) default date format (DD/MM/YY).
Apply Autofilter to the column.
Use the dropdown to DEselect one month (or one year).
Expected: Correct filtering.
Observed: All the date rows get hidden (filtered out).
The date format set to ISO 8601 conforming YYYY-MM-DD, the AutoFilter works correctly.
See also the attachment.
Thanks for reporting the bug. It's a duplicate of bug 106214 and it will be fixed in LibreOffice 5.3.3.
*** This bug has been marked as a duplicate of bug 106214 ***
*** Bug 107472 has been marked as a duplicate of this bug. ***