Problems theme Corporate Fotografie Pro of Catch

Recently built a new website https://wesseldekkerfotografie.nl/  with purchased theme Corporate Photography Pro from Catch.https://catchthemes.com/demo/corporate-fotografie/ Website first filled with articles and pages with associated images. Also installed all recommended catch plugins and other common plugins. Then set theme. The website looked good from the start. The messages/news are displayed properly in the “Recente opdrachten” category. As featured image theme size post thumbnail maintained at 1083 x 542 px. And this image is displayed rectangularly with “recente opdrachten (news) and “Uitgelicht””(Featured). Posted a new message after about 2 weeks “Nazomercursus Keepersschool Spelde 2022”. And now the image with recent assignments (news) is rectangular, strongly enlarged and highlighted (Featured) square display 533x533 px. If I replace the featured image with the message Nazomercursus Keepersschool Spelde 2022 with an existing photo from the media folder with the message Mudmasters obstacle run, the image will be displayed rectangular again with “recente opdrachten” (news) and “uitgelicht” (Featured). What's wrong here? Kind regards,   Wessel Dekker