Why is my ISP finder API returning incorrect geolocation data for specific IP addresses, driving me crazy?

man, i'm completely stuck here. my "what is my isp?" tool's isp finder api is consistently providing totally inaccurate geolocation data for specific ip addresses. it's driving me absolutely insane.

• this `ip address lookup` problem is just relentless for certain ranges. i've been debugging for hours and i'm getting nowhere fast.
• the impact on the tool's accuracy is huge, and i'm pulling my hair out trying to fix it.

has anyone experienced weird, inconsistent geolocation data from their isp api? any ideas what could be causing this or how to even approach it? help a brother out please...