Title disappears after being visited

Hi. I love the travelify theme. Just one issue - the title text disappears - goes white- after visiting a page or post as does the widget titles… I have gone thru the css with a fine toothed comb but cannot find what is affecting this. can you advise?

Could you please provide an URL to your website or at least post a screenshot on how it appears on your website.

Additionally, please check if the same behavior is present on our theme demo: https://colorlib.com/travelify/