I didn’t notice the first two commas in the samples you posted but did the obvious space in the third one. I’m used to seeing inconsistencies in typing but can’t think of a reason for the space offhand, may not mean anything. The first two might be more telling, also the spacing is tight on the second, taller-thinner comma, and it curves to the left more sharply than the one after the 4. No, I’m out of explanations (and patience) for now.