ok
I removed the Lazy Load plugin and now some pictures on the page are not displayed.
any browser.
just reload the page to see the errors. https://oknabau.ru/derevyannye-okna.html
I think that the problem is gutenberg gallery (built into WordPress)
and the problem of displaying pictures is one and the same problem
When the device screen is less than 1024 but more than 800, the problem begins to appear.
I changed the resolution of the displayed thumbnails – I do not observe the problem.
I will observe for some time to make sure of the solution.