commenting on blog comments

Hey there!
I am very thankful for all the people who place comments on my blog posts. Recently I'm experiencing that my comments back aren't posted! I am pretty new in this world of blogging and I have been trying to find out what's going wrong but I just can't work it out! I tried it on different computers and with different ID's but nothing works.

Any experienced bloggers who can help me out here?

ps what happens is this: After typing my comment and selecting my profile, I should type the characters of the word verification image, but instead the comment simply disappears after clicking 'post comment'. Clicking 'preview' makes the comment disappear as well.

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