Eufycam 2 C wont work when set to human detection??

I have two Eufycam 2C which are actually good compared to the price.
I have an issue with the cameras though.
When the cameras are set to detection Humans instead og all, they wont record anything or even detect movement??
Is there any maximum height the cameras must be placed in?
One camera is in 4 meters height and the other one is in 2,5 meter.
When set to all movement it works like it should, but with cats and dog in the garden, the battery will be drained in about 100 days or so :frowning:
Instead I made an schedule security where its only in Away mode when its night time.
Anyone who can help??