Hi @Gerhard, one thing to check, is that the navbar is set to fixed position with a full cover, I would change to to be anchored with a top position and remove the bottom 0px anchor:
Also, another thing I noticed, is that the navbar has a height of 52px. I would also match that in the top margin on the hero section, which currently is set to 50px, not 52 px.
Hi @cyberdave thanks a lot! Did what you said but same behavior with the editor preview - this crazy lines. Don´t understand why this does not occur with the header section but all the others. Header Section sticks seamlessly under the navbar. On published site sections move all the way under the header and navbar hides the pics. Could you have one more look where I built he mistake