Thrall lost HP when restart server

Game mode: Online
Problem: Bug
Region: [Here]

At each server restart, the fighters Thralls lose their full HP. The HP does not increase until I’m on the base. If I leave Base before the Thralls have 100% HP, they stop and do not continue until I’m back on base.

Steps on how to reproduce issue:

They seem to regenerate if any player is in the area. It´s only when no players is around it stops.