Can’t hide entry-title with CSS on new posts – safari only

Hi. Using Pro version and Classic Editor plug-in.

I’ve got dozens of posts where I’ve hidden the post titles using
#post-XXXX header.entry-header h1 {display:none !important;}

I’ve recently created a new post (first one in several months) to find out that my CSS no longer works—but only on IOS/Safari and strangely, older posts are not affected. They’re fine.

If you look at my attached page in both Safari and Chrome, the lighter green title is still visible in Safari. Can anyone offer a suggestion?

• This topic was modified 5 years, 10 months ago by lazykins.

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