Steps to reproduce:
Create a page with the following storage format:
Export the page with Scroll PDF Exporter
Both columns of the table have 50% width
Left column is much wider, ignoring the width from the table layout macro
Change the element surrounding the macro to a <p> tag instead:
This can be done directly in the Confluence editor by setting the text cursor next to the macro and then selecting "Paragraph" in the style dropdown on the top left of the editor.