Divs with dotted lines around elements – why?!

I don’t know what it is but do you know why sometimes (especially on tablet and mobile landscape view) these weird divs around elements appear?

As if they are ready to drop something into them. But they clearly do not have any margin or padding.
They only should be the size of their element, otherwise their size is blocking significant other elements in the designer and you loose design control. Seems like a bug.

If you click on them they disappear and only the element is visible. But before – they always blow up like they want to be huge.

Any help would be great.
Thanks, David


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