Character doesn't touch the objects, but still collides

[crashkandicoot]

http://imgur.com/0wDXtFe

As you can see, this is a multiplayer game, 3 players move the characters and one will controll the bird.
But that's not the case, the problem is that the green guy is not really "touching" the glass. but he's colliding with it anyway.
does this have anything to do with fine detection?

[schrodinger]

You probably should tick "use fine detection"
(if you have a transparent area wider than the drawn object and you want to check collision only for the "non-transparent" area)