I can’t delete an empty row

Hello,

I added new rows to a table but I don’t know what I did that left an empty row that doesn’t appear in the list of rows in the tree on the left on the edit page so I can delete it. It only appears in the source code and on the front page as a larger space between two rows. ( see photo: https://drive.google.com/file/d/1F-xFAOYWf2PW56Q-rYRulJhLOrKQX5CH/view?usp=sharing )

I finally removed that space via CSS but I would like to delete that empty row from the source code.

How can I remove it?

Than you!