Nope, in this case it’s definitely not. Some of us here literally live with this shader so we’ll probably find issues like these in our daily use and testing if it did in fact have anything to do with the shader.
Try my preset pack which has been tested, verified and vetted by yours truly to work as I expect and see if you have similar results. If you still do then it’s definitely something going on your end. Maybe you might need to setup RetroArch and Mega Bezel again. Remember updating Mega Bezel requires you to delete the old folders.
Try these and see, you can also try with a fresh install and you can report your findings in the CyberLab Mega Bezel Death To Pixels Shader Preset Pack thread.