Upgraded the DisplayPort cable to an 8k (4k/144Hz) cable and still had the problem with the single monitor of the three.
Bypassed the docking station for the mouse, keyboard, and headphones input by using a
USB-C to USB dongle connected to the MacBook. Still had the problem with the one monitor.
Finally I bypassed the problem monitor's connection from the docking station by routing its connection through a separate
Thunderbolt 3 to Display Port cable/dongle/adapter connected directly to the MacBook. No more problem.
Not an ideal solution having a three monitor docking station that I paid for having to act instead as a two monitor docking station with a separate adapter for the third but it works and the one off adapter was less than $20.