Exporting the same image multiple times leads to vastly different file sizes

Gigapixel AI 7.1.2
Once im done upscaling the image and exporting it, theres an option called “export again”.
If i’m exporting the same image again without even leaving the export menu it leads to huge differences between the two file sizes.
The image has only been upscaled once but exported twice.
Both are JPG’s at 85 quality and 12288x12288 pixel
Exporting the image the first time was 41,4 MB, exporting it a second time was 13,7 MB.

Why is that? There has to be some kind of difference between the two images.

Thank you for bringing this to our attention.

Would you please reach out to our Topaz Labs Support Team so we may investigate this further?