featured images issue

hi!
I just downloaded Kale, free version. I love the theme but I’m having a couple of troubles with the featured images which I didn’t solve reading the documentations.

1. I had to add to all my posts, old and new, the featured image otherwise no image shows up in the blog feed (in other words, the feed doesn’t automatically pick the first image of each post, like my old themes used to): is that normal/correct?

2. after I added all the featured images, when I select the “2 Small Posts, Followed by 1 Full”, I get a doubled image for the full posts, here’s a screenshot: https://snag.gy/n7IqVX.jpg

can you help me?
thanks!