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After modelling my object, I mirrored it to the x-axis and join them with Boolean modifier ( union) into 1 object and clean up where I joined them. After that, I marked seams similarly to each side. However, the UV islands look completely different, even to the parts that are exactly the same as the object I mirrored

My object, the middle part is where I joined them together

The UV islands

The two vertical UV islands are supposed to be the same ( they are the spines of the object), as well as the flaps. I marked a middle seam where I joined the objects. I don't know if the Boolean modifier may have been the source of the problem.

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    $\begingroup$ I assume you mirrored it by duplicating with SHIFT + D and then S + Y -1 around the 3D cursor? Any particular reason why you didn't use, and then apply a mirror modifier? that wat you'd have ended up with a single object and wouldn't need to use a Boolean modifier at all. $\endgroup$
    – John Eason
    Commented Mar 9, 2022 at 17:50
  • $\begingroup$ @JohnEason You are right. I "Shift D" the object because I don't know how to duplicate it with the mirror modifier at the exact point like in the picture. So I copied the object, select-align objects then Boolean. $\endgroup$ Commented Mar 9, 2022 at 18:39
  • $\begingroup$ Ok I think it would be easiest if you could upload your blend file to pasteall.org/blend and include the link in a comment and I'll rustle up an answer with images showing how I'd do the mirroring. May be later this evening (Uk time) because I'm about to have a meal. $\endgroup$
    – John Eason
    Commented Mar 9, 2022 at 19:12
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    $\begingroup$ In object mode, look at the scale of that object! Select it and CTRL - A > Scale to reset it. Then go back into Edit mode, select all and Unwrap it again. Does that look better? $\endgroup$
    – John Eason
    Commented Mar 9, 2022 at 22:40
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    $\begingroup$ I usually reckon that if something looks off (particularly with bevelling, but it can apply to lots of other things), it's worth checking and applying the scale. Have a read of this article which explains it quite well. Anyhow I'm glad you're sorted! $\endgroup$
    – John Eason
    Commented Mar 9, 2022 at 22:51

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UV islands after using mirror modifier instead of Boolean as suggested in comments enter image description here

Showing scale of object

enter image description here

Scale reset using ⎈ Ctrl + A and object unwrapped again with U > Unwrap.

enter image description here

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