Strange and frustrating behavior

Well, our 4 11.5 week old Silkies stil scream bloody murder anytime they see us...rabble rabble rabble

Anyway, there's a new behavior happening. All of our chickens(the 4 rascals included) are in a porch that is enclosed by mesh. It seems that they have been eating more and more of the mesh, we are worried they are trying to escape/eating stuff that's bad for them. Any thoughts on why they are doing thios or what we can do to curb it?

 

I'm not quite sure what kind of mesh, they defenitely have plenty of food all day every day. It's not very large, in fact we've found some pieces (large squares) on the floor so they're not eating as much as we thought at first, it's still very strange. In a couple weeks they'll be living in a different area so it'll be ok then for sure.