PLEASE HELP. Two computers with the same External IP Address

I have two computers with the same IP address which is causing problems. I tried to ipconfig/release ipconfig/renew but I get the error "No operation can be performed on a Local Area Connection* 11 while it has its media disconnected.
I tried resetting router/modem, made sure "Obtain an IP address automatically" are all enabled. DHCP is enabled.
Two of the computers have the same one and the other IP is completely different (not 1 or 2 off). When I open the router settings and click DHCP Reservation it shows the IPs 1 number off and all different like you said. i.e ***.***.*.106, ***.***.*.107,
***.***.*.108. But with the proxy service I'm using, when trying to allow each computer to use them it shows different IP addresses than what is shown in the DHCP Reservation.
If I clone my MAC address the identical IP of the two computers changes but they'll still share the same IP. The third doesn't change.
I tried ipconfig /release - ipconfig /renew - ipconfig /flushdns nothing yet. Not sure about your #2 and #3. And I just updated my firmware.
Anyone with expertise? Thanks.

Cyber_Defend_Team and ZigZag3143x I powered down all three computers and turned off/reset the modem and router.
I restarted them one by one and after, the two computers with the conflicting IP address changed their IPs but their IPs are still conflicting.  The third computers IP stayed the same.
What else can we do?

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