Strange characters appearing in my text on display but not within upfront

Hi,

I've noticed a strange thing ( as of this weekend ) with my upfront page. I see strange characters appearing in the text. I've identified this on 2 pages so far. What's really odd is when I go into upfront and start to make changes to try and fix it - the text appears properly.

Can you advise ?

The page is here : transformmindset.com/testimonials/

Please note there's a coming soon plugin there as well.

I've activated support access