@Rolthers, I am glad it worked for you. For the creation of chart, like I had said the same logic seems to be applicable for Column and Bar charts both. For Column it looks in order but for Bar it appears reverse.
As the Series seems to be having a series number, there can be an option for sorting to reversing the series in Legend. If you have a valid Splunk Entitlement may be you can present your scenario and a FEATURE REQUEST 🙂
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