Why do I get "GHOST" images

[Bruce19]

Just installed brand new borosilicate bed and when printing up these little squares to check level, it printed a border as they normaly do? The squares after print were measured with dial guage and all were very close +-0.003mm . The squares at left rear, right rear, and left front came of easily. The right front I had to get a wrench to "break" free the beds hold on that one. Front of bed Im thinking gets hotter than rear, is this possible? ALSO how do I deal with ghost image of the border? It has no feeling, cannot remove with fingernail, and smooth to the touch. How to clean it OFF? You can see what Im refering about at red arrows