I have been adding images to Table Builder tables. They are stored in Google Photos. I insert the link location for each image. Most have a .jpg at the end of the URL, but newer ones don’t end with,jpg, ending with -no or something else. This is how Google Photos stores them.
When I look at the page later as a user, I get a nice little popup when I click on the .jpg images. However when I click the non-.jpg images, they take over the window and I have to use the browser back arrow to get back to my page.
It might be also a theme related issue. We will investigate the problem, but if you can provide a live url for the webpage this tables are in, it will greatly help us in solving this problem for you. If you don’t want to share the url here publicly, you can send it to email@example.com