Is this normal?

You should wipe & clean the bracelet after each use. The heat on your wrist or sometimes the sweat or the remaining of the creams that you might have applied might cause this. All of these reasons cause these spots on the clovers. Always wipe them after each use.

However, if these spots have been there for long time, I do not think that they will go away. But, prevent more from happening by wiping the bracelet with the VCA cloth.