Hi Owain, this appears to be the natural way this graph is rendered, as it can be seen in the corresponding documentation for this type of graph, XY Area Chart - in this page.
You might be able to customize the display, but that would require some tweaking with the Graph component that should be living within the following location:
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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