Sticky piston stays activated after powering off

Hello,

I started a new Minecraft world and did a little building. After a while, I finished building what I had desired. Inside my build is a contraption where the player has to shoot a target block and then that powers some redstone which un-powers a redstone torch which then un-powers  a sticky piston. It was all working fine, then I used structure blocks to copy my build. The first few copies it was fine; then it suddenly stopped working. The line of redstone after the redstone torch turned off, but the piston stayed extended.