if you right click and inspect the site on the blog page, and check the Console you will see several warnings ( yellow ) and errors ( red ):
There are 4 x errors related to the 4 x adverts inserted into the feed:
TagError: adsbygoogle.push() error: Fluid responsive ads must be at least 250px wide: availableWidth=0
Amongst other errors and a warning related to the adverts.
You will need to change the ad codes your inserting to make them work correctly. I would suggest speaking with the Ad Inserter plugin author as thy can advise on the settings you require.