Wrong indentation and spacing for manual pages in terminal
Right-clicking a command and choosing open man page in the Terminal window uses the "Man Page" profile in the new Terminal window. In your current white-on-black profile you've set bolded text to black instead of white or another color. Therefore the bold text isn't visible on the black background.

Choosing yellow instead of black as color for bolded text in the Man Page theme would result in a similar crappy display of the grep man page: