Issue in builder preview: BUG?

Hi guys,
I’m facing a strange behaviour in my builder…at a certain time images disappeared and size of the preview changed having a behaviour like someone changed preview device selection and deleted the images (even if in page layout tree I see images).
Even if in the builder I see this stange behaviour, in the preview everything is working fine
Could be a bug in the builder?
I’m attaching an example and the webpreview (mobile preview is fine as well)

UPDATE: If I look in my images preview I cannot see them as well

My app is