Blurry images and missing authors on instant articles

Hi,
for some reason the instant articles from my site alephas.org seem to neither show the authors nor correctly display the featured images, which are always blurry. I linked the fb page with the instant articles, and I use the following rss feed: https://www.alephas.org/feed/.
I′m kinda new to this so I′m sorry if I′m missing something obvious.

The page I need help with: [log in to see the link]