It’s very easy to find out what layout, headers and footers the different areas of your website are using.
Look in the layout manager (Appearance > Layouts) to see what layout those BuddyPress and bbPress contexts are using…
If a layout is not set for the BuddyPress > Members context then the BuddyPress members page will by default use the layout set for the BuddyPress context. The bbPress forums pages will use whatever layout is set for the bbPress context.
Next look to see what footer a layout is using…
Look to see what content that footer is referencing…
Either customise that content or set the footer to reference your own footer content instead of the demo footer content.
My screenshots here are just examples. Your settings may be totally different to those in my screenshots, but the procedure remains the same.