Existing layout blocks moving around when I add another layout block

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Hello,

my site has content blocks and layout blocks alternating below each other. I am trying to add a layout block (one column, four rows) and move it up to a specific place on the page. Bummer is that in edit mode the new layout block is being moved. getting out of edit mode, it shows that another layout block has moved - the new block is still at the bottom.

Does anybody knows this effect and has a solution?

Thanks!