why is my what is my city name tool showing wrong ip geolocation data sometimes?

hey everyone, i just launched a simple web tool called 'What is my City Name' and the idea was just to help people quickly find their current city, you know, super simple. but i'm running into a bit of a snag, some users are reporting that the tool is showing inaccurate city names for them, which is not ideal at all.

it's not always wrong, which is weird, but sometimes it shows a nearby town, or even a completely different state, which is super confusing for them and me! i'm really new to this whole ip geolocation thing, like completely beginner level. so, as a beginner, i'm wondering what are the most common reasons for these ip geolocation inaccuracies? and more importantly, what steps can i take to significantly improve the overall location accuracy for my tool? i'm really hoping some of you experienced folks can share some insights or tips here. waiting for an expert reply.