PHP - Problema con pdf y fpdf para detalle de factura

$pdf = new FPDF();

$pdf->AddPage();

$pdf->Image('logo.png',10,10,-300);

// now write some text above the imported page

$pdf->SetFont('Arial', '', '10');

$pdf->SetTextColor(0,0,0);

//set position in pdf document

$pdf->SetXY(20, 25);

//first parameter defines the line height

$pdf->cell(40,5, 'CORNALO GUILLERMO DARIO',0,1,'L');

$pdf->cell(40,5, 'AVDA BELGRANO 2035 CHAJARI ENTRE RIOS',0,1,'L');

$pdf->cell(40,5, 'IVA RESPONSABLE INSCRIPTO',0,1,'L');

$pdf->cell(40,5, 'PTO. DE VENTA 001',0,1,'L');

$pdf->cell(40,5, 'CBTE. NRO.:',0,1,'L');

$arrayt=obtenerticket($idticket);

$t1=$arrayt[0];

$cae=$t1["cae"];

$pdf->cell(40,5,"CAE.:". $cae, 0,1,'L');

$pdf->cell(40,5,"Fecha Vto.:". $t1["fechavto"], 0,1,'L');

$pdf->cell(40,5,"Fecha de emision:". $t1["fecha"], 0,1,'L');

//force the browser to download the output

$pdf->Cell(15,6,'Cant',1,0,"C");

$pdf->Cell(90,6,utf8_decode('Descripción'),1,0,"C");

$pdf->Cell(15,6,'P/U',1,0,"C",0);

$pdf->Cell(20,6,'Subtotal',1,0,"C");

$pdf->Cell(15,6,'%IVA',1,0,"C");

$pdf->Cell(20,6,'Base Imp.',1,0,"C");

$pdf->Cell(20,6,'Total',1,0,"C");

$pdf->ln(5);

$dt=new Carritoa();

$dt1=$dt->get_content();

foreach($dt1 as $f=>$r){

      $pdf-> cell(15,5,$r["cantidad"],0,0,'R');

			//$pdf-> cell(58,4,$descripcion,0,0,'R');

			$pdf-> Multicell(90,5,$r["nombre"],0,'L',0,1);

			//$pdf->SetY(40); /* Set 20 Eje Y */

        $y=$pdf->getY();

        $pdf->SetY($y);

            $pdf->cell(15,5,'$'.$r["precio"],0,'C',0);

              $importe=round($r["cantidad"] * $r["precio"],2);

			$pdf->cell(20,5,'$'.$importe,0,'C',0);

            $pdf->cell(15,5,$r["alicuota"],0,'C',0);

            $base=$importe * $r["alicuota"]/100;

             $pdf->cell(20,5,'$'.(round($base,2) + $importe),0,1,'C',0);

}

$pdf-> Multicell(90,5,$r["nombre"],0,'L',0,1);

$pdf-> Multicell(90,5,$r["nombre"],0,'L',false);