Hello hacoc,
Thank you for the log files and sorry to hear about any issues that you have faced.
Based on the logs and the configuration that you are using I see that the monitor that has the resolution issue has only one preferred mode 1440x2560 which is supported by it. Hence, when you connect other monitors the docking station can't drive the output at this one and goes down to 640x480 because there are no other modes that are supported by this monitor.
As a recommendation you may connect this monitor to a DP port and other two monitors to the HDMI outputs, this should enable the preferred mode (1440x2560) + two monitors in 1920x1080. This should eliminate the issue.
Best regards,
Jakub
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