my IP geolocation tool is showing completely wrong ISPs, what am i missing here?

hey everyone, i'm back here because i'm still getting totally incorrect ISP data for my users, even after trying to improve accuracy from the last discussion. it's driving me absolutely insane, i've spent literally hours, like 6-7 hours straight, trying to debug this and honestly it feels like i'm hitting a wall every single time. the data is just consistently off, and it's messing with everything in my saas. i've already tried so much, used multiple public IP geolocation databases and APIs – ipinfo, maxmind, even some smaller ones i found, but they all show similar, incorrect results for specific IPs. i cross-referenced with known IPs from my own network and some clients that i know for a fact are residential or from a specific region, but the tool still misidentifies them constantly. i even looked into reverse DNS records and ASN details for these problematic IPs, and sometimes the ASN is correct, but the reported ISP or organization is completely wrong, like it's from a different continent sometimes. i thought it might be proxy detection issues, but these are direct user IPs, not known VPNs or proxies, so that's not it either. for example, a known residential user IP shows up as a major data center or cloud provider like aws or google cloud, which is just insane. ips that are clearly from one country, say germany, are sometimes reported as being from another, like the netherlands. and small local ISPs are reported as huge national carriers. this is seriously affecting our fraud detection algorithms and geo-targeting features, false positives and negatives are through the roof and users are complaining about being blocked or getting wrong content. what fundamental aspect of IP geolocation or ISP identification am i completely overlooking here, is there some common pitfall or configuration i'm missing that causes such widespread and persistent inaccuracy