Rifle Scopes Vortex Viper VRD-6 red dot problem

Terminator2

Just another carbon unit
Minuteman
Mar 29, 2011
99
22
San Jose - California
I have a Vortex Viper VRD-6 6moa scope that I mounted on my Mossberg 12 ga auto. The red dot turns on and off fine and increases/decreases intensity fine, but the dot itself has a small tail on the lower right making it look like a comma. I've heard of antismatism and looked at it with both eyes and it is the same. I then looked through my Aimpoint H-1 on my AR-15 and that dot is perfectly round. Has anyone had this issue with their Viper?