Sure looks like Private Conversations are being posted publicly. Someone should take a look at that since I can see, what appears to be PM's from Gark to ISHeatsMyHome and other messages from other members that are clearly not meant for me.
Those are Profile posts (public). They are talking about a PM in that Profile post. Because of the server upgrade yesterday, it may take another 24 hours before everyone is on the new site. So posts you made, or others you have seen? May dissappear. Until everyone is on the new Server, it will be a little "weird". If that makes sense.
Yep, thats just people writing on each others profile. They are public messages, that has been there since we upgraded to the latest version of xenforo.