It is possible that it was someone else who tried to put an image with LRG watermark on it and a different admin had rejected your image. I try to remember in short term memory when posting in this thread. The queue tool doesn't have a history so if someone doesn't remember, it doesn't really help in replying. That is why when you make a post here, especially for an art rejection, that you link to the image you tried to put rather than just saying it was rejected and not show what it was. In addition, that means that other admins could potentially answer the question even if they didn't work on the queue, or other members for that matter.
Be aware that while there are only 3 DB Admin users, there are still a couple legacy users that work through the queue, as well as any of the red Admins.