Zwo1600mm pro superbias

[redfox1971]

I have created a master bias with pixinsight from my zwoasi1600mm pro temp was set at -20 and a exposure  of 0 seconds total images 200,I created with image integration using linear fit sigma low 4000 and high 2000 then applying a superbias with 5 layers and applying a 24bit function does the super bias look correct with the dark patch on the right?.does everybody else's super bias look similar.