Issue resizing homepage thumbnails.

I’m trying to resize the featured images (also known as post thumbnails) on the homepage of my blog. The featured images displayed on the post themselves are in the correct size, albeit at the end of the post instead of the beginning as I’d prefer. The main issue here however is that they do not resize on the home page of my blog.

From what I’ve inspected, the featured images that appear on the home page are not internally named “post-thumbnail” like they are on the post’s own page, but rather are called “ecae-image”. Using CSS, this definitely seems to be what should modify the featured images on the home page, but I don’t seem to be able to resize them in any way. Using “Display:none;” will cause them to disappear, but no usage of any sort of width or height adjustments will change them.

It’s also worth noting that their current size is far too small in PC view (less than half the page width), a little too small in tablet view, and a bit too big in mobile view. These images only refuse to change size on the home page, and not on the post’s own page.

Any help here would be greatly appreciated. I suspect that it might be partly due to the settings within the Twenty Sixteen theme itself, but I am unsure. It does feel like something external may be interfering.