I Have An Issue With File View Serve File In My Site

My website runs with Elgg v3.3.24 and for a while there were no troubles. but now I started to notice that some pictures aren't showing up and if I post them again (embeded), then all the comments will be gone.
At this point I don't know which plugin is broken or what really happened.
These are the links samples:



I would like to fix these issues.
Thank You.