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As Martin pointed out the 294 colour and mono chips (had em both) are quite 'quirky' but in my experience work fine once you get your calibration for them right.
Thanks for confirming the flats do impact the calibrated image, thats important. if it doesnt hurt your final image no action required.
I'd suggest trying some of the below that I found worked for me:
* 294 flats must be calibrated with matched flat darks. are you doing that?
* subs less than around 2 seconds with these sensors produce inconsistent adu readings, flat and flat dark subs must > 2s. I found the only way I could do this with luminance frames at unity gain was to wrap 3 or 4 tshirts over the led panel, for example. this is also why you dont calibrate 294 images with Bias.
* strong anecdotal evidence that sensor temp on flats doesnt matter. flat dark temps need to be same though so you should still do with cooler somewhat running so this can be controlled.
* if you've been using this camera and a master dark library for a while (>12mths), update it. small degradation in sensor over time can also affect how the master dark calibrates. think adam block did a couple of vids on this explaining the how/why.
* its a colour sensor flat youre making. dont change settings to mono / disable debayering
* i have seen some anecdotes thrown around about the 294 ar / uvir coatings not playing nicely with some filters, but didnt experience this with either of mine. if you work through the above and still got a problem, maybe double check theres no light bleed anywhere in your imaging train?
hopefully some of that may help you. good luck!
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