I altered the curves to make it easier to see. It looks to me like Luke's saber is on top of Vader's. I see nothing wrong here.
Interesting site, but he does the one thing that really drives me nuts.
"After loosing his father's lightsaber, along with his hand, Luke returned to his home planet of Tatooine."
UGH! What is it with the internet that no one can spell "lose" correctly? I understand "Teh" and "pwned" are used ironically, but "loose" is always just plain misspelled.