@leocg YES!!!!

Wrong location (Opera)

Right Location (Edge)

Made at same time, both browers opened.

@leocg
This site https://www.smartfit.com.br/unidades had problems, but right now it is working normally.
I will observe more because the problem appears to be intermittent.

On time:

It worked at first. As I responded to you, the result of the location changed, pointing again to locations far away from me.

@leocg Google sometimes freeze when I click in my location icon on Maps.
I tried, for tests only, on Tinder site for exemple... There, my location is always wrong via Opera. Other browsers are OK.

The only change I made at home recently was to change a router, which is used as a slave, receives internet from a main router. I dismissed the hypothesis of the router, because in other computers everything flows normal.

I realized that Opera is marking my wrong geolocation. I live in São Paulo (Brazil) and sites that use geolocation are showing that I am in Brasília (1000 km away). This happens only on my machine, other computers at home that use opera are normal. On my browser computer as edge, vivaldi, brave, they are normal.
I have already uninstalled and installed, reset, checked Windows settings and everything is in order.
Any solution tips?