Usually the dock will negotiate a slightly lower power rating to make room for its own power consumption. For example my dock from another brand will broadcast 82W to my FL13 when connected to a 100W charger. If there’s a miscommunication between your FL16 and Anker 568 it may cause overloading or under-utilization.
You can install ectool and use the terminal command $ sudo ectool chargestate show and read the chg_input_current value to calculate the input wattage. Note that on FL16, the value is different than the FL13 because there’s an additional DC-DC converter that converts 36V(180W charger) to 48V(240W charger) to 17.6V or 20V(I don’t have an FL16 so I’m not sure) power rail as explained here and here. For Windows, there’s Framework Control.
You can also use a USB meter that supports 48V with PD trigger function. Do not use the trigger function with computer connected as it may trigger the wrong voltage and cause damage. Instead, use the “PD listener” function to monitor the currently negotiated PD power rating while charging the laptop. If you find a mismatch you discovered the problem.