Access to NSUInteger property

I've some problem with accessing NSUInteger property in my code, which look like that:

MyController.h

@interface MyController : UIViewController
  @property (retain, nonatomic) NSArray *updatesArray;

  @property (nonatomic) NSUInteger madeUpdatesCounter;
  @property (nonatomic) NSUInteger allUpdatesCounter;
@end

MyController.m

@implementation MyController

  @synthesize updatesArray;

  @synthesize madeUpdatesCounter;
  @synthesize allUpdatesCounter;

- (void)viewDidLoad
{
    ....
    madeUpdatesCounter = 0;
    allUpdatesCounter = [updatesArray count];

    ....

    // Register for progress notifications    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(makeProgressChange)
                                                 name:@"MadeOneUpdateNotification"
                                               object:nil];
}

- (void)makeProgressChange
{
     madeUpdatesCounter++;
     NSLog(@"Update progress: %d/%d", madeUpdatesCounter, allUpdatesCounter);
}
@end

I'm prosessing my updates as NSInvocationOperation by adding to NSOperationQueue. In the end of the one update action I'm sending notification:

[[NSNotificationCenter defaultCenter] postNotificationName:@"MadeOneUpdateNotification" object:nil];

After executing above code, receiving notifocation is execute only once and in logs I see someting like this:

Update progress: 1/3

When I change line:

allUpdatesCounter = [updatesArray count];

to

allUpdatesCounter = 3;

then everything works ok, and I see in logs: Update progress: 1/3 Update progress: 2/3 Update progress: 3/3

Variable updatedArray is initialized before view is loaded. Is done in this way:

MyController *doUpdatesVC = [self.storyboard instantiateViewControllerWithIdentifier:@"MyController"];
doUpdatesVC.updatesArray = updatesArray;
[self presentViewController:doUpdatesVC animated:YES completion:nil];

Do you have any advices or hints what I'm doing wrong in my code?

OK, I've found reason of my problems. The applications locked by accessing to the same variable by operations launched from queue. When I changed logic of my code, then everything start working correctly.