Page overview questions

[Sprony]

I need some help figuring out where I can change the overview of the news section of my website. As mentioned earlier, someone bailed on me while in the middle of finishing the old theme and based on how the new theme looks, I assume it has got to do with whatever he did. This is the top of my news page:

Then when you scroll down, it looks like this:

I want the entire page to look like the latter with fixed thumbnail sizes (or at least something I can work with since they're now all messed up). Where do I start?

 

[Sprony]

I think you do have to either insert them into the post or else they'll just show as attachments if they're not inserted. Don't really know an easy way around it. Like XenForo's HYS: https://xenforo.com/community/forums/have-you-seen/ all the thumbnails are inserted into the post.

I found a workaround by making the thumbnails bigger by multiplying with 2. So the thumbnail - as you said - is 335x250 and I made that 670x500. Now it looks good in the article and downsized as the thumbnail as well.