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WordPress resizing larger images is a new feature built into WordPress 5.3, it has nothing to do with your plugin. The reason they did this was because 99% of people don’t need images that large or even close to it and were just uploading images straight from their digital cameras when all they needed was a 1024 X 500 pixel version for instance.
You can disable it easily enough by tossing code in your functions.php file. You can read all about it here [https://make.wordpress.org/core/2019/10/09/introducing-handling-of-big-images-in-wordpress-5-3/](https://make.wordpress.org/core/2019/10/09/introducing-handling-of-big-images-in-wordpress-5-3/)
