Images are only focused on the centre when using a new lens, how can I fix this?

Images are only focused on the centre when using a new lens, how can I fix this? I bought a second hand Sigma 18-200mm 3.5-6.5 lens. All of the images I've taken with it so far are really blurry in a circle around the middle, above are some examples from a recent shoot. The centre of the images are in focus but the edge just blurs and I think there's some chromatic aberration happening on some of them. I looked at reviews be...

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