Apparently this may come as a surprise to you but the anime can change things from the manga. A mind-blowing concept, I know.

Oh wow, it's like i said that myself by stating that the anime is not canon because they changed several things from the manga which is the actual series.

The person who commented that she always had light skin was replying to my comment that changing her skin to match the manga was a mistake. So either their comment was referring to the anime or their comment was pointless.

Or they were correcting you on your incorrect attempt of correcting the first person you made your comment replying to.

Oh and Robin was obviously supposed to be dark-skinned in the anime to begin with... that's why she was dark-skinned in the anime to begin with.

Because animators never made mistakes. Sure thing. Smh