I have told you what the issue is, you do not have an up to date version of the plugin. That debug logging you sent me is not in the current version on here 1.3.4. It IS in version 1.3.3, you can test this by simply opening the plugin file and searching for "DEBUG: NPC = Killing". You will not find it in version 1.3.4, but you will find it in 1.3.3.
If you have 1.3.4 loaded and it has this debug logging, then you have somehow got hold of a development version, which is why I asked if you got it from me on Discord. I often send customers dev versions for them to test issues they had reported, to see if they have been resolved.
I can't tell you any more, download a fresh version of the plugin off here, you will not see that debug logging again because it is not in the file anywhere.