I believe I finally figured out the issue with the iPad mini. I feel like an idiot! It was improper installation. Ghosting on a the iPad mini was caused by creasing the digitizer flex incorrectly. It can NOT be allowed to bend backwards and touch the adhesive for the screen (I checked--mine and was bent backwards and creased due to it sticking to the adhesive). The flex must gently bow forward towards the LCD and not be allowed to crease. Unfortunately the digitizer is compromised and unusable. We’ll need a new digitizer but this time I wont make the same mistake. Hope this helps.