Replacing color not working for me

I have a picture that i'm trying to recolor. I'm going to image, adjustments, replace color. I'm choosing the color I want to replace and then choosing a color out of my swatch to replace it with and when the color loads onto my image it doesn't look anything like the color i chose. I don't want to use the saturation, hue, and lightness bars. I have a specific color that I want to use and it doesn't seem to be working. Any help would be greatly appreciated thanks.
It sounds like the colors you want to replace maybe different shades of one color, are you getting down to the pixels to see the difference
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