Published posts body invisible, only titles are showing

Hi,

I have recently changed my theme from heatmap adaptive theme to frontier,

Now my published old posts article body is not showing, only title is visible.

Please help..

I have disabled all the cache plugins , but still not showing.

My Site : https://kretyanews.com

only few new posts are showing full article, and most of the old articles are showing only titles ??

Solution please