Blank filter value in date filter

Hi guys,

i have a date filter that shows a blank filter option for the date range 01.01.2019 - 31.12.2019:

But when i change to 02.01.2019 - 31.12.2019 the blank value disappears: 

The relationship look like this:

1) Date table

2) Order table

3) Item table

Now i don't understand why for 01.02.2019 - 31.12.2019 the date filter shows a blank value but not for 02.01.2019 because if i look at the date table i don't see any blank values for 01.02.2019:

Thanks guys!