Multiple hosted web application templates zoom and center to an incorrect location with custom geocode services when the General-Single Field address locator style is used and the locator is created in ArcMap 10.3.
Option 1 - Use the Information Lookup or Local Perspective hosted templates, where the issue does not occur.
Option 2 - Use a different address locator style, other than General- Single Field.
Option 3 - Use a locator that was created prior to version 10.3.