Perfectly normal. SmartStart on Hubitat retains the info in the list and will include any time it sees the device is ready to pair.
Factory reset on the device will not prevent this from happening, unless you immediately pulled the batteries out afterwards.
You need to remove it from the SS list, or use my app to disable it (which removes it but keeps a record of it in the app so you can easily add it back later): [APP] SmartStart Manager for Z-Wave (Long Range support)