So I bought a Bushnell TRS-25 red dot sight after seeing a lot of positive reviews. When I got it, the 'red dot' doesn't look like a dot at all. Instead of a round dot, I'm seeing a jagged shape that looks like a glowing red filament of a clear light bulb. I've not used a red-dot site before, but I assume I should actually be seeing an actual round dot...correct? Thanks