I have created a map service (via ArcGIS Server) to serve SDE content up to a web map/application in ArcGIS Online. The service contains a group of 10 shapefiles (points, lines, and polygons). All the data is present and the map service works correctly when opened in ArcMap. However, whenever I add the service to an ArcGIS Online web map, the point symbols draw offset approximately 60 feet to the southwest (see picture). Blue selection box is true point position; note the symbology to the SW.
Polygons and lines draw as they should. If I add the individual shapefiles in the group to the map (rather than bringing in the whole service), the points draw fine. Doing this, though, I lose the ability to group layers. All data is in the same projection.
Any idea what's going on?