Blocks are not displayed on the posted page

During last two weeks we have problems with adding new posts. When we add a new posts, that consist of 2 or more blocks (screenshot https://prntscr.com/sbxv05), users see at the page only first block (screenshot https://prntscr.com/sbxxgg).

E.g. if we add some text + image, all the users will see only text. Anyway, in the admin console I see all the blocks (edit mode). Here it is screenshot of code mode https://prntscr.com/sbxzzv.

Could you explain what is the problem and how to fix the bug?

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