If the problem is that the piston is pushing out, I think what's happening is the redstone torch is powering the block above it, which would power a block above the piston if there were one, powering the piston. This is because pistons have quasi-connectivity and will get activated if the block above them would be activated.
Jacob Trokel
If the problem is that the piston is pushing out, I think what's happening is the redstone torch is powering the block above it, which would power a block above the piston if there were one, powering the piston. This is because pistons have quasi-connectivity and will get activated if the block above them would be activated.