Which happens to be far away near Bromma airport. And indeed zooming out fixes the problem for a while, but zooming back in to stockholm center and clicking the filters reveals the marker again. This is probably a bug in https://github.com/airbnb/react-native-maps. Should make a minimal reproduction and file a bug report. There's already some reports about custom images on markers, so maybe the issue is already reported.
To reproduce:
Works at least on IOS in simulator
Pressing the marker reveals that it is this one:
Which happens to be far away near Bromma airport. And indeed zooming out fixes the problem for a while, but zooming back in to stockholm center and clicking the filters reveals the marker again. This is probably a bug in https://github.com/airbnb/react-native-maps. Should make a minimal reproduction and file a bug report. There's already some reports about custom images on markers, so maybe the issue is already reported.