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Hi Yusfi,
Are the flats taken with a flat panel, if so the panel may not have been square to the scope. If they were Twilight flats with a T shirt across the front of the scope make sure the T-shirt is stretched and held tight with a rubber band and also check there are no wrinkles in the shirt.
As you say it does not look right, if nothing has changed with your telescope you may be able to take another set of flats.
You can also make synthetic flats with Photoshop or other Astro imaging software from your light frames.
Cheers Bill
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