Please check your blog page if you have set any title background image for that particular page.
Please make sure the image set in wplms->header->upload title background image is shown on all the pages in the website, and the image set by editing the particular page overrides the default image.
Thanks for sharing the credentials I checked your website and found out that you have set the blog page in settings->reading, refer: http://prntscr.com/d5h8za
Please remove the blog page from here and leave the blog page empty. If you select the blog page here then the index.php file overrides our blog template and hence none of our settings will work on this page.