public IP address tool broken!

man, i'm totally stuck and truely desperate here. my 'what is my ip address' tool is completely messed up, showing totally incorrect public IP address results, and i've been pulling my hair out for hours trying to fix it. it's a super simple tool, always worked perfectly for years until just a few days ago. our users really rely on it, it's a core part of our offering. the problem is, instead of displaying the user's actual public IP address, it's often showing IPs from random regions, sometimes even internal network IPs like 192.168.x.x or 10.x.x.x. it's incredibly inconsistent but almost always wrong now. i've tried everything i can think of. first, i checked all the server access logs (apache and nginx) and they clearly show the correct user IPs hitting the server, so it's getting there right. then i reviewed all our cloudflare and cdn configurations, but there were no changes, i even tried pausing cloudflare completely to rule it out, no luck. i've also gone through our code logic for ip detection, using things like REMOTE_ADDR and X-Forwarded-For, and it all looks standard and hasn't been touched in ages. i've restarted the web server multiple times, even rebooted the entire vps just in case. i confirmed the server's own outbound IP is correct, not some weird proxy issue on its side. i've also tried accessing the tool myself from various networks and vpns to confirm, and yep, still getting wrong results on the tool's output side every single time. what on earth could possibly make a server misidentify the client's public IP address *after* it's been correctly logged by the web server itself? is there some obscure network layer issue or a really specific server-side configuration that could cause this kind of behavior? i mean, are there any nginx directives or linux network settings i should be checking that might be interfering with how the application sees the client's ip? this is absolutely core functionality for us, and we're losing users fast because of it. any expert advice would be a lifesaver right now. waiting for an expert reply.