thumbnails not showing in home page

when i click on the post in home page, that opens up in new page and showing the image. when i add a new post with image, the privious post image disappears in home page have a look at my site. https://chinna.kndesk.com/news/ . There are 2 posts, when i added 1st time, the post shows the image, but when i add the secnd post , the 1st post goes down and thubmnail disappeared.. why ?

[No bumping. If it’s that urgent, consider hiring someone.]