VC top nav looks broken in design/preview mode.. yet fine when published?

If I look at my website in design, or preview mode, the navigation looks broken:

It just suddenly started doing this - whereas before it was fine (unless I accidentally changed/bumped something)

Here is a screenshot of the top navigation going ‘under’ the top of the page:

And yet when I publish it it looks fine!?

(If I put 18px padding in the menu in design mode, then it fixes it there and in preview mode… but when I publish there is an ‘extra’ 18px of padding above the menu, and all the links extra have ‘dropped’ down 18px!)

Very strange - thanks in advance for your help!

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