Well, I think I have figured out for a large part why this is happening, and a common thread between the users this happened to is:
When they have uploaded a profile picture, the "user_image_extension:" is not given to the image, so if I go to their profile and download the image, it only shows/downloads as "20_user_image.", there is no gif, jpg or png on it, though I assume JR saves every uploaded image as a .jpg.
All the other images that show correctly have a .jpg as an extension.
Another common thing between users who's images are corrupted is:
user_image_type: application/binary
They all show that way, though I'm not sure if the latter has anything to do with it not saving/adding an extension to the image.
I have tried uploading .jpg and .png and had no problem with those, so I am not sure if all these images that this has been happening to, are .gif's or something else.
Would love some feedback and perhaps an explanation / solution to the problem.
Thank you
Eddy
updated by @eddy: 02/25/16 03:14:10AM