I have an OpenLayers map.
On to this I have loaded a GeoJSON file.
When I pan the map the GeoJSON data moves relative to the basemap.
Surely this isn't right! Can anyone shed some light no why this is happening?
This happened to me once and the layer was not on the same projection as the basemap.
But without example code, this is like a stab in the dark.
The most likely cause of this is not setting a baselayer's sphericalMercator property to true - by default this is false, so it needs to be set explicitly.