A little problem with YT comments

I made comments on other's videos. 4 comments on 4 different videos. I can see all four comments when I'm logged in from the account from which I made the comments. But when I log in from some other account or just go to that video (without logging in to any account), I don't see 3 comments. One can be seen, but the other three are not visible. And I'm sure that those videos do not require approval before the comments can be posted because if it did it would say so.

What do you think the problem is?

They are getting marked as spam. Click 'view all comments' and you'll see your spam comment there with the option to view it.