Hey all. I just bought a Vortex Sparc red dot and love the concept and function. My question is as soon as I got the optic and turned it on in low light, it seems like the border of the round optics glass is glowing. It's very distracting while acquiring the target. Is this just an issue with this one particular optic, or do others see it with their red dot. Here is a pic of what I'm seeing...