Blog Post titles are not showing in wordpress Site

hi
My wordpress theme is prepared By Robbert Schreuder Hes.
Recently I added blog page but the posts titles are not showing on Blog page.
Instead of posts titles only post content is shown.

https://www.dravronlipschitz.com/blog/

Titles are not shown in all posts

https://www.dravronlipschitz.com/sample-post1/

https://www.dravronlipschitz.com/sample-post-2/

Here is the setting of dashboard > Reading
Front page: Home
Posts page: Blog
Blog pages show at most 10 posts
Syndication feeds show the most recent 10 items
For each article in a feed : Summary