content of 1st row of excel table merged with the header

I processed a table with grids with Excalibur and for some reason the content of the first row appear together with the header content on the header row and the first row appears as empty. The rest of the content appear as normal.

Start by reproducing the report in Excalibur with a PDF table containing grids and inspect how the extracted header and first row are represented. Confirm that the first row is incorrectly merged into the header and that the first row is empty; the work is done when the remaining table rows are extracted separately and correctly.

Written by the indexing model from the issue text.