I'm a right handed, right eye dominant shooter (confirmed numerous times by various reputable instructors using various tests). I've recently started integrating the Wall Drill into my dryfire regimen, and I've found myself struggling with double vision when doing it as prescribed, against a blank wall less than 1" from the muzzle. Images from both eyes are present, and I have to consciously work to select the right one. I've never had this issue in live or dry fire at longer ranges. Is this normal and perhaps intended part of the drill, or do I have something weird going on?