I am register 130 fields but database taking 125 fields only other 5 fields taking 'null' value? why

- (IBAction)btnSave:(id)sender {

    //sUsername=surapong&sPassword=surapong@4&sName=Surapong Siriphun&[email protected]&sTel=0812345678
    NSMutableString *post = [NSString stringWithFormat:@"sUsername=%@&sPassword=%@&sName=%@&sEmail=%@&sTel=%@",
                             [txtUsername text],[txtPassword text],[txtName text],[txtEmail text],[txtTel text]];
    
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    
    NSURL *url = [NSURL URLWithString:@"https://www.thaicreate.com/url/registerData.php"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                timeoutInterval:10.0];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
	[request setHTTPBody:postData];
    
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
    
    
    // Show Progress Loading...
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    
    loading = [[UIAlertView alloc] initWithTitle:@"" message:@"Please Wait..." delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
    UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(125, 50, 30, 30)];
    progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    [loading addSubview:progress];
    [progress startAnimating];
    [progress release];
    [loading show];
    
    if (theConnection) {
        self.receivedData = [[NSMutableData data] retain];
    } else {
		UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Failed in viewDidLoad"  delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
		[connectFailMessage show];
		[connectFailMessage release];
    }

}