Grey Fox hitbox issues

[lYIaXeD OuT]

I just got the full meta knight replacement of greyfox  and he seems to have a big problem with his hitboxes. Its not for every character but Ive seen it for ivysaur that wherever ivysaur is on the stage, his attacks will hit greyfox. So he could hit him with a smash from across the stage. But not everyone does this, ive only noticed ivysaur. So any ideas on why this is happening?