post title blank space

Please add the below code on your style.css

span.thumbnail-post {
    margin-top: -34px !important;
}

Note: Child theme is recommended to customize theme.
https://codex.wordpress.org/Child_Themes

Add below code on style.css

.home .type-post h1.entry-title {
    width: 100% !important;
}

The title of 1st post is little bit longer, due to this some space is appearing. If you make your title on one line, the space will automatically remove.

Thanks