I went to check for replies to some of my posts, and found that they were missing, along with some other posts. In the thread about what to do if you're being attacked, the thread I replied to was gone, as was my own (the latest at the time), and other threads were posted afterwards.
In another thread, my post was gone.

Is it a glitch? Or were they deleted for some reason?

I think some stuff was deleted, for whatever reason. It wasn't limited to the JCF. However, the "What would you do if you were attacked?" thread is still there for me.

That happened to me, too... a while back. Anything posted a few hours before JCF/J2O goes down gets lost. I was mad... I wrote some good stuff in that time. ;(

Check this topic:
http://www.jazz2online.com/jcf/showthread.php?t=11246

The thread is still there, but at least two posts (one of mine, and one which i was replying to with it) were gone.

Derby probably had nothing to do.

Yeah, the posts were missing, not edited with a little cute messages.

As was stated, seemingly whenever the JCF goes down a lot of stuff goes missing that happened around that time. Before I didn't think it had also affected the DB but apparently it does. I know I at least have lost a topic due to this, as well as a handful of things on SJ, but oh well. Can't really do anything about it.