Selected features don't line up with what's on screen

Hello, I'm using flexviewer 3.0, with the Esri aerial basemap (which is the first basemap to get loaded in my config.xml). I am projecting my operational layers on the fly to overlay on the basemap - and I have done this many times before without an issue....but for some reason this time when a feature is selected it does not line up with what is on screen (see attached image). This happens when using the out of the box popup or the eSearch widget.

I'm using my own geometry service, but I also tried the arcgis online url and same issue.
No idea what is going on..

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