Iphone sdk - Strange behaviour with UITableView and UITableViewCellAccessory

static NSString *CellIdentifier = @"Cell";
NSString *enabled= @"1";


UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}


if(indexPath.section == 0)
{
    if(indexPath.row == 0)
    {
        cell.textLabel.text =[section1 objectAtIndex:0];
        cell.accessoryType = UITableViewCellAccessoryNone;
        return cell;


    }
}       
if(indexPath.section == 1)
{
    if(indexPath.row == 0)
    {
        cell.textLabel.text =[section2 objectAtIndex:0];
        cell.accessoryType = UITableViewCellAccessoryNone;
        return cell;


    }
}       


if(indexPath.section == 2)
{
    if(indexPath.row == 0)
    {
        cell.textLabel.text =[NSString stringWithFormat:@"Morning Time: %@" , [section3 objectAtIndex:0]];
        cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
        return cell;


    }
    if(indexPath.row == 1)
    {
        cell.textLabel.text =[NSString stringWithFormat:@"Afternoon Time: %@" , [section3 objectAtIndex:1]];
        cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
        return cell;

    }
}

if(indexPath.section == 3)
{

    if(indexPath.row == 0)
    {
        cell.textLabel.text =@"Monday";

        if([enabled isEqualToString:[section4 objectAtIndex:0]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }
        return cell;



    }
    if(indexPath.row == 1)
    {
        cell.t开发者_如何学编程extLabel.text =@"Tuesday";

        if([enabled isEqualToString:[section4 objectAtIndex:1]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }
        return cell;


    }
    if(indexPath.row == 2)
    {
        cell.textLabel.text =@"Wednesday";

        if([enabled isEqualToString:[section4 objectAtIndex:2]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
            }
        return cell;


    }
    if(indexPath.row == 3)
    {
        cell.textLabel.text =@"Thursday";

        if([enabled isEqualToString:[section4 objectAtIndex:3]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
            }
        return cell;



    }
    if(indexPath.row == 4)
    {
        cell.textLabel.text =@"Friday";

        if([enabled isEqualToString:[section4 objectAtIndex:4]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
            }
        return cell;



    }
    if(indexPath.row == 5)
    {
        cell.textLabel.text =@"Saturday";

        if([enabled isEqualToString:[section4 objectAtIndex:5]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
    }
        return cell;



    }
    if(indexPath.row == 6)
    {
        cell.textLabel.text =@"Sunday";

        if([enabled isEqualToString:[section4 objectAtIndex:6]]){
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }
        return cell;



    }


}   
return cell;