You were most likely testing the plugin on old version before data fix, so after any changes to the config, data files had to be deleted manually or via the /rnpc init command. So, some config changes might not have been applied; restarting the plugin wasn't enough. Although we fixed it and implemented automatic data file clearing, I still recommend using /rnpc init after any changes to the config.
Can i still see your config? You said it was default and then you changed some settings, i want to see the final version.
"Allow dropping items on belt when dead?" - is it false? Also he keeps only active item in belt in the most cases, other stuff is in main inventory, so he still might drop DLC items.