Looks like its normal, here is what I found.
K. Cratty Line.. They are exhibition quality. We have introduced feather legged lines and beginning late 2008 this trait should begin to appear
eggs ordered after that time may hatch some clean legged and some feather legged birds
.. We are working at bringing back the French standard with this flock
eventually our Cuckoo Marans will be fully feather legged
as will all of our Marans