I’ve reinstalled WordPress once again(I thought that might fix this issue) but still having the same problem
Here is what I’ve done.
1. Uninstalled the WordPress and freshly installed.
2. My website is already linked with the Cloudflare so I unlinked it completely by changing the Nameservers on the Domain Registrar
3. Installed the Newspaper Theme (7.6.1)
4. Registered the Theme, Installed the WP Super Cache Plugin and Change the WP Memory Limit to 256M according to this guide “https://forum.tagdiv.com/system-status-parameters-guide/” & “https://forum.tagdiv.com/cache-plugin-install-and-configure/”

http://prntscr.com/e3gi09

http://prntscr.com/e3gwtx

5. Cleared the Cache (WP Super Cache Plugin)
6. Finally when I try to upload the logo and the same thing happened.

http://prntscr.com/e3gi29

just noticed that the posts were filtered from the selected categories, but next to the “MOST POPULAR Title” all the Categories were displaying. I want those categories to be replaced with the selected categories(in my case 41,47,42,45,46)
http://prntscr.com/dv4127

I’ve changed the category filters but still showing all categories in that block
http://prntscr.com/duqp2o

and if I change the category filter in the Big Grid 8 then the Big Grid 8 is not showing on my Home Page
http://prntscr.com/durbod
http://prntscr.com/durbs3

• This reply was modified 9 years by GizmoSource.

update: I’ve found the way to remove the logo for the mobile theme.

Update/Cache Issue:
just now I’ve noticed that it isn’t happening when I reload the website in the same web browser. but on the other browsers (in which I haven’t logged in to the WordPress) it isn’t updating the changes until I clear the cache.