Why would forum owner chose to delete your messages?
You should direct that question to the forum owner. I really don't know the answer.
If it was a personal forum (like Ask xxxxxxxx) then you should know that forum owners are Gods inside their own forum. In other words, a forum owner can do whatever he/she wants, as long it is in accordance with CureZone TOS.
Some forum owners often chose to remove messages from people they disagree with. Change the forum.