Imaging ON 05 April with Meade 10" ACF @f10 with QHY8L OSC, 14x300secs acquired and processed in Nebulosity 4

This is the third time imaging this target and in each case I seem to get this problem. I dont have this problem with any other targets. It looks like light leakage into the camera. This particular target is quite near to the zenith and maybe at this position I am getting leakage into the camera from the computer screen. Pity, I like this image !
JJB