InDesign Table headers do not align in different columns

I have tables that appear in a two column format with table headers in each column. The table headers are not lining up. The right column's header aligns slightly above the left column's header. I have a title over the columns set to "span all columns". I've checked for invisible characters that might be interfering, checked the space-before and space-after paragraph settings, made sure I had true paragraph breaks, nothing out of the ordinary. I've tried different fonts to see if it's a font issue causing the misalignment. I've looked in the dialog boxes for any setting that might cause this to be ajar. 

Here is a screen shot of my setup. I have the hidden characters turned on so you can see my paragraph breaks. Any idea what might be causing this? I'm all up to date on hardware and software so it's not a "old version" or "old machine" issue.