Borders still showing – Bordered table option not checked

Hello there!

I want the table to be borderless.
So I didn’t check the Bordered table at the Table Style options.
Still, the borders are showing up. There is no difference, if the Bordered table option is checked, or not checked, the table is looking the same – with borders. It is the same with Bootstrap3, 4 or Semantic.

Thank you in advance!