MapView annotations change their layer order when touched - iphone

Question

Small question, i've got a few annotations on a map view. Sometimes they tend to overlap when they are very close to each other and that's ok, but when i touch them they switch their layer position. Those that were in the back are now in the front and vice versa.
So i checked my didSelectAnnotation function but there is literarily no code in that function so it couldn't be it.
I couldn't think of anything else that might cause it.
Do you know how to fix it so it won't change layer position??
This is my viewForAnnotation code:
annImg = [[szAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"current"];
szPointAnnotation *pointAnnotation = annotation;
if (appDelegate.homePage || ([pointAnnotation.tag intValue] >= 10000))
{
annImg.canShowCallout = NO;
annImg.backgroundColor = [UIColor clearColor];
annImg.frame = CGRectMake(0, /*0*/-78, 70, /*78*/156);
UIImageView *currentUserPictureView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, 60, 60)];
int newTag = [pointAnnotation.tag intValue]-10000;
UIImage *currentUserPicture;
if ([pointAnnotation.tag intValue] >= 10000) {
currentUserPicture = [UIImage imageWithData:[usersData getKeyForIndexWithKey:#"UserImageData" forIndex:newTag]];
}else{
currentUserPicture = [UIImage imageWithData:[usersData getKeyForIndexWithKey:#"UserImageData" forIndex:[pointAnnotation.tag intValue]]];
}
currentUserPictureView.image = currentUserPicture;
userLocationButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 70, 78)];
[userLocationButton setBackgroundImage:[UIImage imageNamed:#"pin.png"] forState:UIControlStateNormal];
[userLocationButton addTarget:self action:#selector(centerOnUser:) forControlEvents:UIControlEventTouchUpInside];
if ([pointAnnotation.tag intValue] >= 10000) {
userLocationButton.tag = newTag;
}else{
userLocationButton.tag = [pointAnnotation.tag intValue];
}
[userLocationButton setBackgroundColor:[UIColor clearColor]];
[annImg addSubview:userLocationButton];
[userLocationButton addSubview:currentUserPictureView];
[userLocationButton release];
[currentUserPictureView release];
[currentUserPicture release];
}