Bug in Gihub projects "labels" feature

I have created a project on Github, inside an organization,
I created a label named “feature” and then assigned a pink color to it
Then after assigning that label to some issues using the sidebar, that label disappeared.

So I created a new label with the same name but chose a different color (blue).

Then I started assigning the new label to newer issues.

Now I have two colors for the same labels, and in the labels menu, I can only see the newer color.