I'm trying to set-up ZoneManager with ZoneManagerAutoZones, but I'm struggling with a spam of notifications when entering / exiting the zones that are generated.

I enter the zone and I get 3 chat-notifications:
WARNING: You are now entering a PVP Zone
WARNING: You are now entering a PVP Zone
PVP Enabled

I leave the zone and I get 3 chat-notifications.
Returning to PVE Area
Returning to PVE Area
Leaving PVP Area

This is a completely fresh install of both plugins, with all data/config/plugin files that I had tried before removed.

How do I fix this so I only get one notification for joining and one for leaving?

When removing the data files you have to make sure you unload the plugins prior.