Table & mixed inks on InDesign 18.1

I created a group of mixed inks from 2 Pantones (432 and 2995) in 10% increments (121 shades in total).

I create a table with alternate backgrounds (FPGP2995 shades 1 and 12). Everything's good. But when I select the first line to change it to shade 121, it systematically puts it at 20%! And if I change the percentage, it selects PFGP2995, i.e. the ink group...and the line stays white! I am attaching screenshots.

No results.