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found.
.wp-block-cb-carousel.header-slider {
margin: 0;
padding: 0;
width: 100vw;
height: calc(100vh - 2.8rem);
}the last line – the height: calc(100vh - 2.8rem);
triggerd this behavior..
i think in the iframe that is used in the editor the 100vh is the iframe height..
and i think it is a kind of feed-back-loop..
the editor tries to read the height and then sets it.. and therefore the height inside changes….