From last 2 weeks my posts are decreasing, What is the issue?
I have the same situation as you are right now. The issue of your post decreasing are,
Your post may be posted in wrong section.
Your post may be considered a spam.
Your post may be out of topic.
Your post may be posted already by another user that will lead to duplicating of topic.
Try opening your message inbox in bitcointalk forum. They will send you a message that your posts are deleted because it is off topic or any other reason. Tips I have read is avoid posting things that needed to be deleted.