Pictures diappearing

It has happened some months ago, then it got fixed, now again, if one posts a pic by url from listal not only from listal,but in partilcular from here, to a list using the new editor,sometimes it collapses and disappears a few seconds after

Same issue. mainly in my sections that are set on "single image"

now also some of the Header-Pics on the lsits are disapperaing and all going fray or black in the header