You’re talking about the visual editor just below every topic right?
As you can see bbpress works here in my site. I haven’t done anything so I’m not sure what might be causing your icons not to show. bbpress probably has a conflict with one of your plugins. Try to temporarily disable them and see if that works.
Can you temporarily turn this on? : “Allow guest users without accounts to create topics and replies” so I can see if the visual editor display correctly.