I created a project in QGIS with project CRS in
EPSG:3857, packed it for Qfield with Qfield Sync plugin and saved it to my Android device. When I open the project there with Qfield and activate GPS, my position shows in a completely wrong place: northwest of Svalbard islands somewhere in the Ocean (see first screenshot below). I am, however, in Zurich, Switzerland.
Using other apps (like OsmAnd) on the same phone with same GPS receiver, I get the correct position. So the problem is obviously with Qfield.
If I zoom to my point layer an then zoom out, I realise that the points are way off the OSM basemap: see second screenshot below. My region of interest shows up, GPS position is somewhere down. When I pan to the GPS position (blue dot), I have to heavily zoom in to see the dynamic OSM basemap. So my point layer + the saved static raster basemap is completely wrong as concerns position and scale. So the problem seems to be connected with this one here.
I have no clue what went wrong. How to solve the problem?
Region of interest with the static raster OSM basemap, saved as gpkg file by the Qfield Sync plugin on the upper part; my position (blue dot) at the lower part. The dynamic OSM basemap (XYZ tiles) does not show as it is zoomed out too much: