I believe what they are trying to tell you is to login from an IP address that is not masked by Cloudflare, not that you have to use the exact same IP that you made a withdrawal from. If you are using something like Private Relay on Safari, or Microsoft Edge’s built in VPN, it will give you an IP address from Cloudflare.

If there is something on your device or browser that might be changing your IP address, you can try disabling it to see if it solves your problem, otherwise, it might be something in Nitrobetting’s Cloudflare configuration that is causing your IP to be converted into a Cloudflare IP.