I had a couple pigeons in my hay barn. I shot them yesterday evening with my1701. T he last one flew away after a hit. I went out tonight with my PP700. I noticed I could see the red dot with the lights on. I turned them off and the red dot would slowly fade away. I shined a flashlight and could see theft turning it off the dot fades away. Is that normal, that you can't see Aled red dot in the dark?