Responsiveness not working with Collection List

Hi, I have a collection list at the bottom of my page which uses link blocks. For some reason, if I add anything other than an image to the link block, it stops the entire page being responsive. Is there a reason for this?

thanks (link to read-only below)

Here is my site Read-Only: LINK
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Hi @osintltd

Remove the Image Height that is set to 50% and the link block height that is set to 300px