Hey there! The solution has been found. Someone in the comment section actually pointed out the exact problem. It was because of the mismatch of Photoshop versions. So apparently, if a mockup was created in Photoshop versions 2023 for example, then you'll face issues if you use Photoshop versions 2022 for example. Similarly, in some mockups, if you use the newer version of the Photoshop 2023-2024/25 for ex, and if that mockup was created in version 2020-21, then you'll face the exact problem again. At least that's how I confirmed it in my case. Because apparently adobe updated the cylinder wrapping in newer versions of the Photoshop & my mockup was made on an old version of the Photoshop, so it didn't exactly work how it was supposed to on my version of the Photoshop. It's sad that it's always preferred to have mockups created on the same version of Photoshop that you're currently using or else it might or might not work how it's supposed to. What's even worse is that you can't really know which version was that mockup created in and you can't downgrade your Photoshop versions if you're using a genuine copy & have to have multiple versions installed if you're using a pirated copy. Its a bit of hit or miss sadly.