When using the Zoom function in the feature information pop-up window with multiple features selected, if the particular feature is outside of the current map extent, it does not zoom or pan to the correct location.
Tested using the sample app and was not able to reproduce the issue: http://ess.maps.arcgis.com/apps/Viewer/index.html?appid=117618769f6f47a1be44f16e6758d655