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Please post a screen-capture of your export settings.
btw: The jpg file size is not a reliable indicator on the quality/size of an image.
The jpg format uses lossy compression to reduce file size.
A low quality setting will create a small file with reduced quality, a high quality setting will create a larger file with little or no apparent loss in quality.
The other factor that affects file size is image content.
Images with lots of busy, sharp detail (or noise) do not compress well, and will result in a large file size.
Images with large flat or smooth areas compress well, and will result in a small file size.
The difference in file size between your two virtual copies could be due to one having received more sharpening than the other, or that one is noisier than the other. A high Clarity or Dehaze setting could also increase file size.
As you have seen, the difference in file size can be quite dramatic for images with the same pixel dimensions, and the same quality setting - and this is entirely because of different image content.
You may find this article useful: File formats
41 kilobytes, 80 quality
146 kilobytes, 80 quality