Strange problem with AutoFilter

Attached is a much reduced sample of what I am trying to achieve.

I am trying to filter 3 tables to show ONLY blanks via a button on the sheet.

I am getting a strange result, the first table filters out 1 of the blank rows but leaves in a row that is not blank.

If you click on the filter symbol at the top of the column it shows that it has been set correctly, when you click on ok it shows correctly, but the other 2 tables are then incorrect.

What am I missing?