Not sure if the circle is clear enough but there seems to be an extra line between the title and the graph.
This is how my other dashboard looks like :
How do I remove the extra line as circled in the first diagram?
In the Format Borders menu (see below) do you have anything in the Row Divider - pane section? That can create that line you see in your viz:
try changing the Row divider to none.
Right click on the chart and select format option and go to Border options. Refer below screenshot.
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