Markdown images not loading

In my markdown files I am loading images with relative path like img/sql/sql-2.png

Here is my markdown syntax for loading an image
![Alt text](img/sql/sql-2.png)

But, it isn't rendering and couldn't load the image. Bizarrely, I see that, in one of the files it's loading a few of the images.

Here is a part of my markdown source which is not properly rendered as html

And here is the preview of it

Upon browser console examination it didn't transform to html properly

In other cases, markdown to html transformation is correct but couldn't load the resource.