Hi there,
a couple of things:
1. if you select that top most GB Container block, in its Spacing you will see there is Top Padding of 100px
You can set this value independently for Desktop, Tablet and Mobile by selecting the different device previews.
2. inside that top most container block, is another GB Container block, select that, in its Spacing there is a Top Margin of -230px
. Change that to 0
as that is creating the overlap.
You can now remove that spacer block as it won’t be required.