Duplicated model elements

Hi all,
I’m implementing an ATO/ERTMS onboard system and I’m using Capella as a beginner. In my model I see what looks like duplicated logical components (e.g., AD_core : AD_core and also AD_core, as shown in the screenshot). Why does Capella display both, and how can I avoid this duplication/confusion?
Thanks in advance.

You can turn off the “parts” in the PE - look here

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