The underlying cause of this mismatch in coloring is that every browser has its own style of rendering emojis. The same emoji may look slightly different depending on the operating system or browser you're using.
Atlan uses a lot of styles along with emojis in the app for different needs. These different styles may have been overriding for certain emojis. This mismatch in display has been resolved by ordering the styles that get loaded in the app.