My suggestions: uncheck the Default object detection box (it definitely doesn't need that checked). Also, unless you are also simultaneously experimenting with the facial recognition feature (very much a work in progress), uncheck both of those boxes as well.
The path for custom models that you are using is the "old" standard for DeepStack, and while some workarounds are included when installing CPAI that allow this to work for now, it isn't the real folder where the models are stored. I don't have the exact real path at my fingertips ATM, as I am not in front of my BI machine, but it is under the CodeProject/Ai folder structure if you look for it.
Edit: you can also remove the "objects:0" from each camera's settings page. The way you had it setup originally was telling CPAI (or DeepStack previously) to first USE Default object detection, then overriding that setting by turning it OFF for each camera with the "objects:0" setting.
Also, if you open the CPAI control panel in a browser, check to see which modules are running; once you "lean this down to the essentials" it only needs to show the YOLO Custom models as a running component.