So I made this circuit in a map I am making, but it doesn't work just right.

The single command block on the right adds a score to a scoreboard needed for the players to get a set of items, while the chain of blocks on the left of the circuit removes the scoreboard point. The items are given by a set of repeater command blocks, each given a different item. However the problem is when I start the circuit by placing a redstone block on the left of the AND gate, it gives me TWO sets of times, not just one. I tried slowing the circuit down, speeding it up, etc., but I still get two sets. Any ideas?