As shown in my screenshot you can see some photos of mine in a folder in which there are JPEG files with the StylePix icons and some without it.
I've wondered why this problem and I've found out that the unique difference between a SP iconized file and a not-SP iconized file was the lenght and the width of those saved JPG files, exactly they have got a format of 4000 x 3000 instead of the rest "of the world" in my folder with a "lighter" format...
I don't know if it is that difference the bug I continue to see but up to now that seems to me the real problem.
If needed and if you can write to me what to do, I can investigate...