Hey Astha Srivastava it seems like your article cover is not loading - maybe you want to look at it. It looks like it tries to download a document instead image..
https://cdn.hashnode.com/res/hashnode/image/upload/v1621424390377/EC_H__WFz.vnd.openxmlformats-officedocument.wordprocessingml.document?w=1600&h=840&fit=crop&crop=entropy&auto=compress
For example my looks like this:
https://cdn.hashnode.com/res/hashnode/image/upload/v1621194467041/rXHV4I6uh.png?w=1600&h=840&fit=crop&crop=entropy&auto=compress