Why, when I create a CollectionView, and dequeque two cells with different identifier, the latter are attached to each other?
The cells with the same identifier have equal distance between them, instead the cells with different identifier are stuck together.
Here my code: 

```
  - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 2;
}

- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section;
{
    if (section == 0) {
        return 1;
    }
    if (section == 1) {
        return 10;
    }
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
    UICollectionViewCell *cell;
    if (indexPath.section == 0) {
        cell = [cv dequeueReusableCellWithReuseIdentifier:@"AddCell" forIndexPath:indexPath];
        UIImageView *cellImage = (UIImageView *)[cell viewWithTag:1];
        [cellImage setImage:[UIImage imageNamed:@"pulsante_trasparente.png"]];
    }

    else if (indexPath.section == 1){
    cell = [cv dequeueReusableCellWithReuseIdentifier:@"PictureCell" forIndexPath:indexPath];
    UIImageView *cellImage = (UIImageView*)[cell viewWithTag:1];

    [cellImage setImage:[UIImage imageNamed:@"mi.png"]];
    }
    return cell;
}

```

Please help me!