Second Monitor won't display full 1080p resolution

I just purchased the TBT3-UDZ and using on my Thinkpad P43s and the system won’t display full resolution on both monitors.

The laptop tech specs say:
Monitor Support
Supports up to 3 independent displays via native display and 2 external monitors; supports external monitors via HDMI® (up to 3840x2160@30Hz) or USB-C (up to 3840x2160@60Hz)

The Monitors are:
Samsung LU28R55 this will display 3840 x 2160
Samsung LC24F39 when I first used this it only flickered but did display at 1920 x 1080 and when I found online others that had the same issue and it was fixed with a firmware I installed the firmware on the dock but now the flicker is gone but the highest display resolution is 1280 x 800

Any ideas? I purchased this to allow me to use 4k on my main monitor and 1080p on the second.


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