Why Does The Display Cable Length Change Screen Resolution?

I have a Power Mac running two 23" Samsung Displays using 6' cables. This has worked fine for 3 years. Recentily I tried to use 15' cables, but it changes the resolution of the displays. The resolutions are not even the same.
Any ideas on this? The 1st image shows the screen resolutions with the shorter cables. The 2nd image shows the resolutions with the longer cables.
Thanks!

Do not use the menuBar item for debugging. It shows only "greatest hits". The full range you can select from will be shown in:
System Preferences > Displays
The DVI connector on the computer outputs a "regular" VGA signal in the blade at the end and the four pins around it, plus H-Sync (which is in the top row of the grid next to them). Its "adapter" just swaps the signals around.
The Mini DisplayPort adapter asserts a signal to the Mini DisplayPort which requests VGA-compatibility mode, and the interface produces an approximation of VGA.

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Why Does The Display Cable Length Change Screen Resolution?

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