Some pages won't load in edit page sections - wordpress

So basically I'm stuck with this screen on some of my pages and they never load up. I'm using Avada theme and fusion builder. What could cause this problem because it's appearing only when I try to edit some pages and others I can edit normally
On the pages that won't load this appears in the console

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Contents of Accordian to Load Only on Open - WPBakery JsComposer Qode Wordpress

Everything I want to do is set properly in wpbakery. I would like the contents of my accordion not to load on general page visit but to load when a user opens it. How do I do it?
There was a qode option about it and wpbakery seems like no help over there either. So I have done very little.

Wordpress Pages Show Missing Photos Error

When I look at my Wordpress website, there is this error message on every page, even the pages that don't have any images
There are no photos with those IDs or post does not have any attached images!
I am using the Sinatra theme but I had the same problem when I was using the Twenty Nineteen theme. I am also using the Justified Image Grid plug-in and the error seems to be coming from this plug-in.
To solve this problem, I went to the plug-ins directory and downloaded justified-image-grid-core.php and removed the error message manually there. That did the trick.

WordPress backend menu items not loading

On our website, we use the Ubermenu plugin. As I was creating a menu within WordPress' backend, the menu items suddenly no longer appeared. I've disabled Ubermenu and a bunch of other plugins but they just won't show. Has anyone come across this before?
Edit to add: Also, I just noticed that the Screen Options and Help tabs on the top of the page also don't work. But work fine on every other page.
There are some js errors in console?
Or, do you edit some files inside wp-includes folder?

Changing a template on a blog page - WordPress 3.5.1

I am using an older version of WordPress 3.5.1.
I know how to use different templates on different pages but the problem is I cant figure out how to set a different template for my blog page. When I open the page Blog in the Edit Mode I see a blank page, contrary to my other pages which display their content. Is it possible that this page is a redirected from somewhere else and how can I figure it out? Also when I change the template from Page Attribute it does not take effect. On any other page it works but this one. How can I figure out how to change the page template?
There's no built in selectable templating system for blog posts. Its based on the actual template files and their hierarchical structure.
http://codex.wordpress.org/Template_Hierarchy
Its probably your index.php or single.php that is throwing an error. I would go into the wp-config.php and find the line that says define('WP_DEBUG', false); and change that to true. Then reload the page and see if it spits out an error. A basic loop is only a few lines of php, so I would guess there's an error somewhere on the page.
As for the pages not changing when you change the template, its possible there is conditional code or something in the template itself. Are you saying it only changes the look of the page on some pages but not others?

Slider and contact form only appears when the wordpress page is refreshed

I have a mysterious problem with my wordpress theme : HiTech from SMThemes. I nearly finished my website and didn't notice the problem until today : I realized that when I was accessing my (static) homepage from the menu, some of my plugins (slider and contact form) wouldn't display. But when I would refresh the page, my slider and my contact form would reappear.
The reason I didn't notice the problem is that the only page who had those plugins were on my homepage and that I never tried accessing my homepage from the menu until now... So after I realized that I tried adding sliders and contact forms on my other pages to see if the problem was only with the homepage. The same problem appeared : when accessing the page from the menu, the plugins wouldn't display. I checked the URL in the menu : the exact same than when I refresh the page...
I tried to compare the source code of the page refreshed and the one not displaying the plugins with firebug and I realized that there were empty DIV tags when the page wasn't refreshed (where the plugins were supposed to be)...
I found that really weird, I tried to use other plugins and in most of the cases the problem occured. Though I did end up finding plugins with which I didn't have to refresh the page I am really curious to know if someone knows where the problem comes from ?

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