I probably wouldn't replace google_analytics
template like that... then you have the potential of having ba_google_analytics
added twice.
Not sure what would cause what you are seeing, but custom styles and/or other addons doing something funky are most likely the culprit. If you want to go down the road of figuring out what it is, you may want to set it back to the way it was when it's doing the double requests, and slowly disable other add-ons one by one until it stops doing it. Then at least you know which add-on to look deeper into.