Syncadapter onPerformSync being called twice the first time

My syncadapter works well, except for one thing. After the user installs the application, my app syncs twice. Later, if I manually sync it in "settings" it syncs just once as expected. It's just the very first run of the app that this happens.

Here's the code in my "onCreate" that creates account if not already created and sets up the syncadapter. Any ideas on what I'm doing wrong?

    if (accountManager.addAccountExplicitly(appAccount, null, null)) {
       ContentResolver.setIsSyncable(appAccount, PROVIDER, 1);
       ContentResolver.setSyncAutomatically(appAccount, PROVIDER, true);

       Bundle extras = new Bundle();
       extras.putBoolean("dummy stuff", true);
       ContentResolver.addPeriodicSync(appAccount, PROVIDER, extras, 43200);
    }

My desired behavior is for the app to sync once immediately after installation and then periodically as per the "addPeriodicSync" statement.