Secondary Title appears in Homepage (Only Phone, not Desktop)

Hello!
First of all, congratulations for this amazing plugin.
I am begginer here and this is my first website / blog.
I do need help as you can see using your cellphone, in the webpage (slider) this post shows the title and the second title.
I don’t need to see the second title of my posts in the homepage, I just need the title. The second titles must appear only on all posts.

Thanks!!

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