Hello  @NoMadPH 

Sorry for the late reply,

Double check if there is any Wi-Fi extender between router & the camera,

To help isolate the issue, try to connect the camera directly to router if possible, not AP or extender and see if that makes any difference. 

For ' they do not get assigned the reserved IPs I set for them. They automatically acquire an IP from the DHCP pool.' 

Can you help provide some information 

1) a photo of the IP reservation settings &  IP address did not accord to the IP reservation settings. 

2) the MAC address of the camera (please share via PM)

3) Model of the router, and network topology ( note if have any Wifi extender in the network topology) 

Example: ISP X - router Archer C7  -<Ethernet> AP model <Wireless>Tapo C100

 Thank you. 

  @NoMadPH 

Glad to know the issue is solved on the router side! Thank you very much for sharing the solution with the community.