glas bug ?

hello…I having this problem for a wile now…I think its a bug :(…I making this glascube just for ilustration. I cant reselect it…the second picture shows what happens…it select somehting else that it behind it :(…is this a bug ?..have to be :(. As you can so from the picture its refuse to select the cube. I click on the cube and its select stuf that is beside or behind it :/. I notise this problem when I put in some windows for my reasturang. If I zom in to it and click on it it select the wal behind it.