HTML Code Appears In Email Notifications and on Website

I am using BBPress for forums. Email notifications and website are including HTML Code. Initially I thought this was due to members copying and pasting into Visual Editor but it is now happening with ALL posts, including those that are written (not pasted)

1. How do I remove the code from the emails please and yet retain the formatting?

2. How do I remove the code from the website and still retain the formatting?

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