Dahua 32 Channel Nvr 4432-16p Camera Adding And Delete Process?

I have a Dahua NVR 4432-16P, 32 channel with 16poe channel switch built in. I added 16 cameras plug and play. I think it started at 192.168.3.65 and as I added cams the number just went up, no issue. I added a 24 port switch to channel 16 and just plugged that camera (Channel 16) into switch worked just fine. So now were at 192.168.3.80 at number 16 camera. I added cams up to 28 by setting IPs incrementally up to 93. Then i had a issue with one cam and unplugged port 15 and 16 doing testing and now camera 15 is port 16 when it should be port 15. When you delete the camera it just reappears. Whats correct way to avoid this?

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