Quality loss saving an image in .gif extension

Hello,
I've a problem with Adobe Fireworks CS5 when I save an image in .gif extension. 
I open a .gif image with Fireworks and if I look at properties of image (tab optimize) these are: format: gif, palette: exact, number of colors 46. 
Then, if I would to save this image with another name, I press CTRL + SHIFT + S , and, in the dialog windows I choose: format GIF, palette: exact and I save with the new name. 
When I open the new file saved with Firework and I look at the tab optimize the properties are: format: gif, palette: exact, number of colors 14, and the image is a loss quality image. 
I want to know why when I save in .gif format there is a loss in the number colors? 
Can somebody help me? 
Thanks!

Hi Linda,
When I look at the color numbers in the Optimize panel, before to save in .gif it's 49.
When I look at the color numbers in the Export Preview panel when i,m saving in .gif, it's 49.
If I look at the color numbers in the Optimize panel, when I open the file that I exported in .gif, it's 14.
The loss value is set to 0.

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