A line distorts the screen of my Moto G topic

Hi all, is it updated my Moto G Android Lollipop following the tutorial to pass the Moto G to Google Play Edition, and then wanted to go back to the original version 4.4.4 of my phone so doing I notice that after the message bootloader a line that distorts the image starting from the top to the bottom, the only way to solution I've found is blocking the phone and unlocking it, but still the problem persists appears.
Thank you very much for your attention and I hope to help. :(