I will take a look at it but it's not the issue that SEOMoz tell me as this format concerns only images. It's actually a little trick to do lazyloading on images.
The link you pointed out on your example is good ("/annuaire,amkashop,site,promotion...) as comma are not encoded.
And for your example I see no issue except capitalization.
I bet this is a Moz problem because when I fetch as Googlebot, I don't find encoded URL...