Bug report on Blog

Hello,
It begain with previous version and continues with 4.4.2.

Several bugs on Blog behaviour

1. Cannot make Blog feed with summaries in the list. While in the Settings I choose and save

For each article in a feed, show – Summary
It always shows Full blog text.
Only featured images are like tumbnails.

2. Inserting Read more tag in post text in admin interface causes collapse of the whole page with blog feed – no more previous post entries are shown and no footer is shown.

3. Creating pages – feeds of with different cathegories is impossible – the content shown in a full way – even all images are full size (here not even thumbnails).

I like your theme very much – wanted to rate it high but now I am very distressed for already sevral days try to find out how to fix the blog.