It also appears on chrome in another form — article published does not appear very well, it leans vertical. So to work effectively I used chrome/opera to write stories then I views list of published stories on Safari. It only started after latest WordPress Update.

Thanks for your response Simion, in my last post, I should have said that all plugins were disabled except td composer, though I have also enabled Visual composer yet I still can’t add sidebar.
I think I should also explain that I watched the video tutorial on how to created a webpage in 3 minutes I followed all the instructions till I got to were I needed to add a sidebar to my webpage. that was when I ran into problem. As you can see from the link https://africanquarters.com/?page_id=4049 every thing is okay except that when I clicked on the last element to add a sidebar just like what I saw on the video, instead of the sidebar appearing beside that element only, it pushes up to the top of the page and distorts the whole page.

I deactivated all plugins except Visual Composer

I am having same problem, the sidebar does not work, I tried following the instruction in the video, instead of affecting only one block as in the video, it alters the whole page, inserting sidebar from top to bottom.