USB C Video running at 30 Hz in 4K

@milasx We connect the display(LG 27UL850) directly to the C port, which can display at 60Hz. We can also use a C-HDMI converter (ugreen)to achieve 60Hz display. However, if you use a converter with USB 3.0 hub functionality, generally it will only display at 30Hz due to the hub utilizing the bandwidth of the C port.
Can you share the Anker model number?