We have a rate limit on images, but that wouldn't explain all of them failing.
There is a also a size limit, but I don't think you hit that. I'll try to peruse the logs later.
Edit: I had a look. It's bloody weird. We use an application to handle image uploads/storage/serving, etc.
For some reason, the first record I have is of it issuing a delete command for your image.
I'm sure it's not you, but I am very curious what happened now lol.
Were you using the web interface, or a mobile client?
Also I tend to externally host my images (on Lensdump, other services are available) which takes the strain off the instances hosting and keeps everything in one, easy to find location. It should, at least, get around any issues like this.
Oh and I also started !photography@feddit.uk if you are interested. I just need to get my arse in gear and post there!