Post Text Overlaps Sidebar

Hi,

I have a slight issue with my current theme Skirmish which I really like but my homepage which is also my post page has the text overlapping the sidebar. This only happens on the homepage and when there is more than one post on a page. If you click an individual post it’s fine.

Can anyone work out why it’s doing this? I can’t seem to figure it out.

My site is: https://marktiddy.co.uk

Thank you

Mark