I have problem using phoenix with RX 570 8G

i attached only 1 RX 570 but phoenix detect 2 VGA

GPU1: Radeon RX 570 Series (pcie 1), OpenCL 2.0, 8 GB VRAM, 32 CUs
GPU2: Radeon RX 570 Series (pcie 1), OpenCL 2.0, 8 GB VRAM, 32 CUs

i try using 5.5c dan 5.4c and the result same. Anyone can help?