It's probably a Lenovo board, which usually has most of the IO on a daughter board connected to the Mainboard. Only the USB-C that had the display port/HDMI alt mode sits on the Mainboard.
That's a widespread practice among OEMa that want to use the same board in a 13/14" chassis and a 15/16" chassis. They just need a longer cable to the daughterboard for the larger laptop. That usually means all the high-power and high-speed ports are on the same side of the laptop and on the far side you get USB 3.0 and headphone ports.
