uMap markers move when saving

Help and support
1

I’m creating a custom map using uMap, and I’ve found that when I add a new marker and save, the marker moves from where I placed it.

See the following screencast for an example:

Peek 2026-09-11 20-51

  1. I add the marker
  2. I enter details in the ‘Feature properties’ popup (off-screen)
  3. I have to slightly drag the map in order for the marker to show (another bug?)
  4. I press Save and the marker moves position (I drag the map to show where it went)

Anyone else experience this? Is there a fix/workaround for it?

Sometimes a marker stays put when I first add it and save, but then later on (hours/days later), after having added more markers in the meantime, I find that the original one has moved slightly from where I placed it…

2

Wow, that looks like a bad bug.

You should probably raise an issue at Issues · umap-project/umap · GitHub .

Be sure to include which instance you are using (openstrreetmap.fr ?) or even the url of the map if it’s public. Maybe you can find the coordinates of the marker, before and after saving ? Might be a rounding error, or something with projections… :person_shrugging:

Regards