I seem to recall misunderstanding what (2 Max) means as well and reporting it as a bug several years ago. I wonder if using "Avail" instead of "Max" might prevent this confusion? Then I wonder if it will come up enough more times that it is worth changing?
Or maybe showing (1 Max) if it's single equip? After all, we are there looking at how many can be equipped, rather than how many we have ? Doesn't sound too challenging a change, if wanted (though I may regret saying that).