Wish i knew, all my returners do the same thing. Don't think vision is causing the problem, all of them have plenty of vision.
We had 30 punts with 18 returns for TD's in our first game but any time the punter or someone else starts dribbling his way toward the return guy- even if he could easily just blow past them- will cause the return person to start dodging and dekeing trying to shake the guy or something. Sometimes they'll purposely not try to go forward and slam into the person edging his way over toward the return man.
We've fiddled with the elusiveness but doesn't seem to make any difference.
Like this play
http://goallineblitz.com/game/replay.pl?game_id=740259&pbp_id=3854034 If he would have just run straight down the sideline, Rosario #8 doesn't look to have enough speed to have caught him, nor the punter whom he actually dives straight into.
http://goallineblitz.com/game/replay.pl?game_id=740259&pbp_id=3854478 Here's one where a guy who is pancaked and flailing around on his back down field scares him and makes him dodge a few times for no reason.
They don't seem to do this kind of thing as much on int's, though often there are not as many guys in the way.