Didn’t replace most of the colors

This plugin effectively identified the colors in my theme, but it didn’t work completely when I tried to change the colors. I tried replacing a red with a blue, but I still had 80% of the red (on my homepage) remain as red. However, approx 20% (of the times where I had words/icons in red) did actually change into blue, though.
I was using a child theme of the Specia theme in WordPress 4.7.