Read more button issue

Hello,

I have an issue with the read more button, sometime it’s not appear it’s just the text read more.

I think it’s since the last update.

I use the theme layout and classic layout.
Our website is on wordpress 5.8, but the issue was before the update.

Do you have some tips, advice or a solution on this issue?

Best regard,

M

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