Fixing the slider and pictures

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Job Description

Hello,
I own a wordpress website where people post stories and other pieces of literature works.
The website is: http://sophisticatedstories.com/

The boxes (pictures) below the slider are disproportional and look incorrect when compared to the slider.

I need someone to fix this by separating the slider pictures from the post pictures. Right now the theme works by having the featured image of the post for both the little pictures below and the big slider on top. I hope someone can help with this.

Thank You so much for applying, have a nice day!