System preferences icon has replaced the dock

Hi all

I have a strange behavior with the dock in macOS Sierra, especially with the "System Preferences" icon After you open the system preferences application, the icon was his suddenly replaced by another icon (see image below). It looks like a Doc App icon?

I tried to remove the 'System Preferences' app to the dock and put new in. It's OK for a while, but something after a few hours or days, the icon has been replaced by the "Doc App" icon again? !!

Is there anyone who has this strange behavior?

Thank you

Torp

See this possible solution: Re: app icons disappeared from the dock

Tags: Mac OS & System Software

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