I have the following excel file

I created a form with a blank subform like the following (with exactly same field names)

then I clicked the Import data (it shows that everything is ok)

but in the report shows me 3 empty records. Why this happens? How can I add these 3 records in a blank subform and to show them in a single record in the report (as we know, whatever we add in a blank subform it keeps it as a single record)?