[mst]

They (almost) always get higher CA on APS-C than on FF. Even with the same lens tested on the same body.

Could they have simply mixed up red and blue dots?

I assume it's because of the scale they use (%). Question is: percent of what? Image size in some way seems plausible (I didn't find an explanation of the scale on their site), in that case it would seem possible that the percentage values on crop are higher than on full frame if the absolute CA values are similar.