Source Serif Pro bold doesn’t show

Please follow the link mentioned and you will see the second paragraph beginning with the sentence: “As you can see, italic works fine whereas bold does not.” (Obviously the bold word appears in normal face in that page.)

The problem surfaces when using the Marigold style which sets the font family to Source Serif Pro, not with the Default style (différent family).

The page I need help with: [log in to see the link]