I am not sure if it is related but things like videos can trigger moderation to kick in. I have personally switched off moderation since the current mechanism is by no means efficient. Any topic / reply that goes to moderation just vanishes and the user is not informed. This is clearly not OK but I have no idea to improve it in the bbPress code.
There is a ticket open for this issue for several months now but I don’t think it is being worked on. You can go into your discussion settings and adjust certain properties that affect when content will trigger moderation. This is in your WordPress settings.
But like I say, I switched off moderation all together due to the confusion is causes for users. There are other topics on here with info on how to do that.
I am not saying it is the cause of your problem. Just wanted to mention it.
thank you so much for the reply. But i figured it out. After you post the topic in the WP Admin, you must go to the Topics section in WP Admin ad view the topic in the User Interface and then when you reply from the User Interface it works.