If I understand your question, you are wondering why you are not seeing comments you have left. It is possible the other blog owners have comment moderation, or for some reason your comments are being tagged as spam. If they are labelled as such, the blog owners would need to unspam them.
Is your issue happening to every comment you leave?
I just noticed that comments I’m posting today on other blogs are not showing up on their blogs. The blog owners do not have their site on comment moderation could there be another reason. I usually comment on these blogs every day and have not experienced these problems before today. Something wrong with the system?