UICollectionView didn't render properly - ios7

Question

The program has a tableview. Each TableViewCell has a UICollectionView. When user drag and drop the one of the categories label, the program will add a UICollectionViewCell which has a UIView. It works well. However, when user scroll the tableview then the UICollectionView won't render properly. The display is as below.
This is the pic before user scroll the view.
http://cl.ly/image/1P0s3Z0m443t
After user scroll the view, there is a promise overlap the sin. The promise cell shouldn't be there.
http://cl.ly/image/3L2M1s3s3F0X
Here is my code of cellForRowAtIndexPath
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
// Configure the cell..
/*
There is no UITableViewCell in the storyboard
*/
ContentViewCustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
UILabel * cellLabel = nil; //The cellLabel is for rendering the bible verses
if (cell==nil) {
cell = [[ContentViewCustomTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
/*
To Make Dynamic Cell Height
*/
cellLabel = [[UILabel alloc] initWithFrame:CGRectZero];
[cellLabel setNumberOfLines:0];
[cellLabel sizeToFit];
[cellLabel setFont:[UIFont systemFontOfSize:FONT_SIZE]];
[cellLabel setTag:1];
[[cell contentView] addSubview:cellLabel];
}
NSString * text = [verseArray objectAtIndex:[indexPath row]];
CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);
CGRect rectangular = [text boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin attributes:#{NSFontAttributeName: [UIFont systemFontOfSize:FONT_SIZE]} context:nil];
CGSize size = rectangular.size;
/*
When There Are Rows More Than One Screen
*/
if (!cellLabel) {
cellLabel = (UILabel *)[cell viewWithTag:1];
}
cell.CellContent = text;
[cellLabel setText:text];
[cellLabel setFrame:CGRectMake((self.view.frame.size.width*0.39), 0, CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), MAX(size.height, 44.0f))]; //To Locate The Position Of The Label In The Cell
cell.userInteractionEnabled = TRUE;
return cell;
}
And this is ContentViewCustomTableViewCell
#import "ContentViewCustomTableViewCell.h"
#import "AnswerCollectionViewCell.h"
#implementation ContentViewCustomTableViewCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
UICollectionViewFlowLayout * layout = [[UICollectionViewFlowLayout alloc] init];
layout.sectionInset = UIEdgeInsetsMake(3, 3, 2, 2);
layout.itemSize = CGSizeMake(30, 10);
layout.scrollDirection = UICollectionViewScrollDirectionVertical;
self.collectionView = [[AFIndexedCollectionView alloc] initWithFrame:CGRectZero
collectionViewLayout:layout];
[self.collectionView registerClass:[AnswerCollectionViewCell class]forCellWithReuseIdentifier:CollectionViewCellIdentifier];
self.collectionView.backgroundColor = [UIColor colorWithRed:0.1 green:0.1 blue:0.1 alpha:0.1];
self.collectionView.showsVerticalScrollIndicator = NO;
[self.contentView addSubview:self.collectionView];
}
return self;
}
- (void)awakeFromNib
{
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
-(void)layoutSubviews
{
[super layoutSubviews];
self.collectionView.frame = CGRectMake(10, 10, 110, 50);
}
-(void)setCollectionViewDataSourceDelegate:(id<UICollectionViewDataSource, UICollectionViewDelegate>)dataSourceDelegate index:(NSInteger)index
{
self.collectionView.dataSource = dataSourceDelegate;
self.collectionView.delegate = dataSourceDelegate;
self.collectionView.index = index;
[self.collectionView reloadData];
}
#end