Something is really screwed up with my panels. When I add icons, the next day some of them have doubled. When I remove one of the two icons, they both are deleted.
Any clues as to what is wrong?
Thanks.
Sounds familiar. I had the same issue (only two icons were double).
This is what I did to solve it on the panel:
remove indicator-applet-complete
add indicator-applet
In my experience indicator-applet-complete adds some extra stuff like networking and/or sound which already have their own icon.
Maybe this works also for you. 
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