RED DOT PROBLEMS..... NEED ADVICE
I HAVE A RED DOT SCOPE ON MY CROSSBOW ANDAT TIMES THIS YEAR I HAVE WENT HUNTING AND SHOT UNDERA DEER, I WENT HOME AND SHOT AT MY TARGET AND THE CROSSBOW WAS SHOOTING 6 INCHES LOW AT 20 YARDS. ANYONE HAVE ANY ADVICE ON WHAT TO DO, OR WHAT MAY BE HAPPENNING??