Comparator stay powered after a Command.

I actually try a Quest System, but, if a command block run a command, the output comparator fix to 1.

I can change this problem with a Repeater, but the comparator return to 1 when the Reapeater is on 0.

Clock > CmdBlock: testfor @a[-0,56,-1115,r=1,score_Patron=0] > Comparator not fix to 1 > CmdBlock: tellraw @a[-0,56,-1115,r=2,score_Patron=0]

{text:" .... ",color:dark_gray}

> Comparator Fix to 1 after run the command.