Help identifying what’s causing this

Help identifying what's causing this I noticed when I take a picture with wide aperture everything looks fine, but when I take the same picture with narrow aperture this "crack/hair/line" appears on the corner. I tried with a couple of different lenses and it happens on both. I'm very new to this, can someone point me in the right direction please. Is is it fixable? ​ Pictures to s...

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