There are different download sizes for downloaded jpegs when the script is run multiple times

[as-muncher]

First time running the program for my book, the folder of jpegs is 224 MB, size on disk 226 MB.
renamed the folder

Second time running the program for the same book, folder size is 144 MB, size on disk 144 MB:
renamed the folder

Third time running the program for the same book, folder size is 112 MB, size on disk 114 MB
submitted this issue on github

[as-muncher]

I think this is due to a lot of jpg's not being downloaded correctly.