The Pull Quote style does not work properly. Recent problem!!!

Recently I noticed a problem with the quotes in citations. It looks as if the browser couldn’t find the image corresponding to the quote. This is pretty sad since it happened suddenly. I am not at all a CSS type of person. I just trust that the Hueman theme would always do a great job (I am not suggesting that this is the fault of the Hueman there developers). What I would like is that it would be fixed.

However I can follow technical instructions (steps) when it is clear.
Remember I am not a programmer.
Please someone can help?

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