Looks like the newest articles are being formatted incorrectly. On the first 2 the "hover-thumbnail__body" is a sibling of "hover-thumbnail" rather than a child, as it is on the other correct pieces. You can see in the image below how thstructures differ.
Hopefully this helps get you going down the right path
Thank you for looking into this. Would I edit this in each carousel in the design manager? Not sure how the code got messed up. All I did was add 2 new blogs? How will I make sure that any additional blogs don't continue to have this issue with the carousel?
It looks like you are working with the HubSpot Technical Support team regarding this issue. As they are actively investigating this matter, working with them will be the best option to finding a solution for this matter. 🙂