UIScrollView's origin changes after popping back to the UIViewController

In iOS 7/8/9 simple self.automaticallyAdjustsScrollViewInsets = NO; solved the problem in my case.

Try this in viewWillAppear of the view controller you pop back into:

 self.scrollView.contentOffset = CGPointMake(0, 0);

Edit: When also adding Peter's code you get the best results with:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:YES];
    self.scrollView.contentOffset = CGPointMake(0, 0);
}

plus

- (void)viewWillDisappear:(BOOL)animated {  
    self.recentContentOffset = self.scrollView.contentOffset;
    [super viewWillDisappear:animated];
}

and

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    self.scrollView.contentOffset = CGPointMake(0, self.recentContentOffset.y);
}

You return to the original scroll position, have no visual side-effect and the scroll view itself is correctly positioned in its superview (which was a problem) after coming back.