Hi Scott,
Can you check the HANA Version on your Appliance and check if you have Embedded Statistics Server
This is an expected behavior for HANA systems that have Embedded Statistics Server(ESS) activated
you can check the status of the ESS by executing the below query on SQL Console
SELECT * FROM _SYS_STATISTICS.STATISTICS_PROPERTIES where key='internal.installation.state'
You must see output of columns
KEY VALUE
internal.installation.state Done (okay) since "Date when ESS was activated"
If this is the case do not attempt to change the state of the user _SYS_STATISTICS
Hope this helps
Sunil