Thumbnail images not showing on the post page

for me, the same, after removing the size of the photo, it displays the originals, but the thumbnail does not

I have the same problem, but if I change the browser screen size after loading the page (Edge and Chrome) the thumbnails appear, but with the title in the wrong place.
Similarly the thumbnails are the wrong size (and fuzzy) in the Post sidebar…
Eg. https://amplifyingvoices.uk/what-does-peace-look-like-to-you
I’m using the Beaverbuilder Theme and Themer.