Thumbnail not displayed correct

Hey guys,

I have problems with the display of my homepage. I am using the theme twentyfourteen. If I poste the first page of my site

(http://markhuber.bplaced.net/) no picture is displayed and the text starts with the date and the user.

If I post one of the sites from my navigation bar, the picture is displayed but the text starts with the site title (http://markhuber.bplaced.net/publications/)

I believe it’s because of that code in my child css

.entry-title {    font-size: 33px;
    font-weight: 300;
    line-height: 1.0909090909;
    margin-bottom: 2px;
    margin: -24px -24px -24px -24px;
    text-transform: uppercase;
    display:none;
}

display none means that it doesn’t show the title right? But it’s still there, so how do I get rid of it at all?

I also tried to add a featured image as desscribed on so many pages but it didn’t work.

Does anyone have an idea? Thx