I found this post after installing ha-map-card. All my default maps started behaving as you explain here (showing Amsterdam and no markers). After uninstalling ha-map-card they went back to working correctly.
Do you by chance have ha-map-card installed?
Just came across this issue myself and I was the same, didn’t have ha-map-card installed in the first place, installed and that fixed the problem for me.
I also have this issue, have tried both with and without the ha-map-card.
Refreshed webcache and still no go. The zones seems to be OK its just when you open the map it always start in Amsterdam…