First of all:
- This is a pretty uncommon issue, so be sure you are being honest with yourself about your trigger control, sight picture, and steady position.
- It is also usually only experienced with infrared, and is still pretty uncommon at that.
False diagnostic lines or inaccurate hit location reporting is basically a result of laser bloom or flare which looks something like what you see in the picture below:
LASR always draws the hit indicator and the diagnostic line in the center of the "bright spot" it detects. When laser flare (as pictured above) is bad enough, the software can think that it is multiple laser impacts, and/or movement of the laser.