I didn't know where to put this so I'm doing it here. I built a carry look-ahead adder, but the carry-out blinks rapidly when I use the chip. When I put the same inputs in editing the chip, the blinking stops, and I can't figure out why.

Here is the  chip 

CLA Logic

If you connect multiple wires to the same input of a chip it starts blinking really fast. Maybe there’s just two wires connected to the same input but they’re on top of each other, so you don’t see.

Thanks but I rewired everything several times and by viewing the chips I found out it was one of the And gates that were already in the game.