CMS collection un-aligning on preview

Any idea why when I “preview” my site, or indeed when you view the live site that this CMS collection is leaving a big gap between 2 of the items in the bottom row? I’ve tried seemingly every setting and wrapping the children of flex boxes etc! Does it have anything to do with the link blocks?

This section is at the bottom of the “blog”

Please see

Here is my site Read-Only:

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