URL contains /” alt= 404 inks

I have created two posts with Greenshift builder from these one is How to Block Websites… but a link was automatically generated containing https://cbshop.in/blog/how-to-block-websites-on-chrome-mobile-and-pc-a-comprehensive-guide/%20alt= which results image type 404 links. I searched but not found the cause.

Now kindly suggest any action in this regard.

The page I need help with: [log in to see the link]