Yes, a few of my 6 month old ISA Browns have done that. They free range all day and return to the coop to lay and for the night. Except for the weird shell eggs (like the ones you mention) all the eggs are laid in their nest boxes in the coop. If the egg has a weird shell (ultra thin, jelly egg) it's almost always out of the box or on the floor of the coop or outside. It sortof reminds me of an "oops!".
I'm told chickens usual egg laying cycle is one egg every 24-26 hours. Sometimes, before their egg laying mechanism's really settled down, young hens will ovulate more than one egg yolk at a time. Sometimes each egg is fully developed (yolk, white and shell); or one is fully developed and the other is missing something (like the shell); sometimes one egg is a double-yolker; sometimes you get a humongous double yolker and also a tiny egg with only white inside the shell.
I really don't think it's because of the free ranging or the breed, though perhaps your FR's and my ISA Browns may be more susceptible to doing it. My feeling is it's because our birds are still young.
