For all the others, who cannot see the response in the incident, the issue is related to the configuration we suggest in Start Personas Flavors from the Fiori Launchpad and the transaction you are using. We were able to reproduce it e.g in VA03 but not in SU01. The behavior differs because the behavior of clicking the back button in both transactions is slightly differently implemented.
We started to create a more comprehensive guide of how to use SAP Screen Personas and the SAP Fiori Launchpad. It already contains three alternative approaches to configure a launchpad application. The issue you describe will not happen if you use the 'Generic Service' approach.
Cheers!
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Tobias Queck
SAP Screen Personas
Lead Architect