One of the first things I did when I joined this server was build a tower in the sky with a glass "sphere" at the top. Recently I noticed there were a couple of blocks missing from the sphere. I figured it might have been a design oversight on my part, but when I checked logblock, I had in fact placed blocks there. They were never removed, yet they were apparently gone.
At this point, I wouldn't have said anything, but then several days later I noticed the same thing. Two blocks were missing, but this time it was lower down on the structure -- in fact, directly below where it happened last time. Again, according to log block, the block was never destroyed. It might have been from the same incident, but I'm not sure since I didn't notice it before.
This is the first time I've used log block, so I don't know a lot about it. I assume any activity should show up on the log unless an admin deletes the log.
Then again, perhaps I am simply having some fundamental misunderstanding.
If someone removed the block and attempted to hide their crime, I really don't mind. In fact, the "sphere" I constructed is a hideous eyesore, and I would completely understand if someone wanted to grief it.
I'm just confused as to what happened. Am I going crazy? Have I uncovered some sinister conspiracy?

Screenshot of before I replaced the glass and the corresponding logblock entry after I replaced it:


Summary: What is wrong with the above image?