Is There a Bug in extracting structured data using "Extract Wizard"?

While scrapping structured data i face that sometimes the data is only scrapped for first column, for example in the below screenshot the first coloumn is selected:

sample.pdf (16.8 KB)

Has anyone faced this, any suggestion to overcome this ?
Also what is the metada meaning - <extract-table get_columns_name="1" get_empty_columns="1" />