Extract issue with smart-phone on Catch Box theme

Hello everyone, I have an issue with Catch Box theme on my blog (www.gr20-blog.com) I have set up the setting to just have extract of posts on the home page. When we are navigating on the home page with a PC or a tablet, it’s OK : extracts are well displayed. But, not with smart-phones (Android and iPhone). With all smart-phones, there is the issue : extracts are not displayed ! We read the whole post, instead of the extract. I don’t know how to solve it ? - On the Wordpress dashboard, Settings > read, “extract” is well selected. - On the setting of the Theme, it’s also well selected. Could you please help me to solve this issue ? Thank you in advance Emeric