Blocks destroying eachother after placing.

I created a custom item to place a custom block. It looks almost like redstone, and I've found a way to make the textures change if placed next to eachother or making a corner. However, the problem that I'm running into now is that when I place two next to each other, they both are destroyed and drop the item. Also, the 'whensteppedonbyentity' dependency that I made isn't functioning. I'm not sure what to do at this point. Any suggestions?