I will look into this on Monday. It may not be something we can “fix” however. It is possible that this is a change to the software that runs the forum and intentional on the part of the developers of Discourse. If that is the case, and isn’t just a setting that got switched on, our hands will be tied.
Honestly, though, the forum isn’t the best place to use as an image repository for sharing. We have limited storage and eventually anything you upload will be purged to clear up space. A better option is to create a Google drive or something similar that the owner has direct control over.