Https no padlock on my site

I recently installed Ssl certificate on my website and forced all links to run on https with really simple ssl plugin but the problem is it is not loading with a padlock on it. When I try to access posts and other pages (except the homepage) on my website, it shows attackers might be able to see through images and trick you through it.
I need to tell you all that all my images are already loading in https. I also tried to fix this issue via insecure content fixer plugin but it couldn’t help. Also the about page on the website does not contain any images. What’s the issue there?
I also tried to figure it out via why no padlock but the same reason ‘no problems found’.
Sometimes the website automatically becomes fully secured which means when I access posts and pages, it has padlock too with the homepage but most of the times the site’s pages and posts don’t have a padlock and show the same reason ‘Attackers might be able to view images…’
I hope my 100s of searches come to an end here.
Website link: https://www.talesforlife.com