Guild Wars 2

I like to take camps alone. But what is a source of frustration is the mechanic where an NPC started to walk back to its spawn point and within a few seconds regain all of its health even if you are still hitting it. Its hard enough taking camps alone as it is, and with auto upgrades happening soon it feels like my camp capping is worth even less. So why does this still happen? The NPC is is combat (being hit) and the regain of health is just at a ridiculous rate that I would never be able to do. Why is this happening still?

You moved out of range of where the NPC’s reset point was. NPC’s are noly allowed to Travel so far before they leash. Once you reach that point( this point is based on where it has to move in order to hit you, not it actual location, this is why ranged mobs will pursue farther) it will drop out of combat, reset aggro, and attempt to return to its tether spot. Most of the time it will not reenter combat until it gets there( spawning a minion seems to reengage them sometimes.)
If you want to be effective at taking camps i suggest you spend a little more time learning the tether points of the mobs as to not have this happen.

No one drawn a map or some info of this anywhere?

Try not to leave the camp, if you need to get some distance, use the objects in camp to LoS them and this won’t happen to you as often.

This leash thing is also why if you want to take a camp which is larger, you should LoS them somewhere nearest the middle of the camp, preferably closer to the melee npcs.

Stand behind the depot or a house or a pillar and pull some of them there, they wont reset that easily then. Unless you are miiiiles away then yes, they may reset then.