For any of you who are still having trouble with this game-breaking problem, I'm happy to supply an explanation of how the system works, and how to make it benefit you in the video below (it's far too much to type, trust me). I am happy to report that most issues related to this are NOT bugs, and thus are WITHIN your control.
Source: https://youtu.be/07dqSt3d3oU
Also, I have just released another video going into much more detail on Keeper habits, as well as all other types of staff. This teaches you how to make efficient work zones, and how to assign each type of staff correctly (and in the right numbers). This can greatly impact the success of your zoos both financially, and in terms of smooth operation (no alerts).
Source: https://youtu.be/-ApsweDnBWA
Also, I have just released another video going into much more detail on Keeper habits, as well as all other types of staff. This teaches you how to make efficient work zones, and how to assign each type of staff correctly (and in the right numbers). This can greatly impact the success of your zoos both financially, and in terms of smooth operation (no alerts).