I noticed some time ago that some of my own comments were getting filtered, and thus did not appear on the post page.
I only recently discovered where those missing went, and was taken aback to discover that the Typepad software marked some perfectly good comments by others as "spam". I now look at the "spam" comments every day to see if such mistakes were made, and correct them.
Just today, I rescued a perfectly good comment by JohnWDB.
Otherwise, if your comment doesn't appear on DOTE, that means that it is temporarily in "spam" limbo, it really is spam, I deleted it or you are banned.