Thank you Jamie. This adapter is based on the DisplayLink DL-160, an old product which is unable to do full HD.
The resolution offered is the highest resolution advertised as supported by your monitor and in the range possible for the device. That resolution is 1440x900.
The DisplayLink DL-160 is unable to handle the throughput necessary to send all the pixels at full HD resolution. This is a hardware limitation.
Display Modes
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640x480x24@60
640x480x24@67
720x400x24@70
800x600x24@56
800x600x24@60
1024x768x24@60
1024x768x24@70
1152x864x24@75
1280x800x24@60
1280x1024x24@60
1440x900x24@60
1920x1080x24@60
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