- What do you mean when you say that Amazon pinpointed your location? Did it show an exact address? Longitude and latitude? A city? A country?
- How do you know Amazon did this through your IP address?
There are other ways for a browser to leak your location. For example, this could be done based on the time zone of your user profile. Did you enable IronFox's time zone spoofing features?
In your Orbot user profile, visit https://browserleaks.com using both Vanadium and IronFox. Compare the values across the different leak tests to see what's different.
https://discuss.grapheneos.org/d/2590-tradeoffs-on-running-tor-browser-and-orbot
Tor Browser is designed to work best with Tor, but Tor Browser should not be routed over Orbot on Android since it creates a "Tor over Tor" scenario. If you wanted to use Tor Browser from an Orbot profile, you'd need to use split tunneling to exclude Tor Browser.