Hi James,
I appreciate your quick response over the query.
I tried deactivating the cache plugin and tried to reload the blog page, Related posts appeared fine.
However, If I keep it activated and take into account the Errors you posted above(although I did not get them, I somehow got them fixed) and having them fixed, Why would it still not work?
Also, I checked the xhr shooting away for ?relatedposts=1, the response for it(when caching plugin is on and the console is error-free) was an unformatted HTML page.
Here is an image for your reference:

I believe this is some configuration issue.
What would you like to add or please correct me if I am wrong?
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This reply was modified 5 years, 5 months ago by keshav929.