dates fields from calculated table shown in a different way

I have a table with 2 date fields:

there are no null values in both fields.

I'm creating a calculated table with: 

Distinct recs= Summarize('main data', 'main data'[name],'main data'[FINAL EXP],'main data'[document_create_date])

but for some reason the fields are seen in a different way in the new "Distinct recs" table (I've renamed the fields):

both fields types look the same:

Anyone has seen this odd behaviour before?

TIA