“Invalid geometry supplied for task” for Maproulette

I use this Overpass query to create a Maproulette challenge:

[timeout:50];
(
    node[shop](area:3600114938);
);
out body geom qt;

It outputs valid nodes and in the "tasks"-section of my challenge, in the table I see lots of entries like this

ID     Priority Name    ...     Location                             Status Actions
2418504 High    360298302       Some({"type":"Point","coordinates":[5.3182887,60.3855342]}) Created

But when I view the task I get this red errorbox with the error

 KO : ColumnName(.location,Some(location))

or

Invalid geometry supplied for task.

depending on where I "view" it from.

Any idea why these geometries are invalid? What do I have to do to get this working?