Taskbar Windows opens a "separate" tab when opening the program pinned broweser

I recently installed firefox because it does not lack when it comes to the display of kanji.
But there is a strange thing happening. I pinned my firefox on my windows task bar. When I open firefox to the pinned shortcut, it opens a "separate" tab in my taskbar. No other program never did.
Do you have any idea what is happening?

I added a picture to show what I mean

Thanks for any help you can provide.

Open Firefox. The icon on the left, make a right click and delete it.
Now the other one, Pin it. Turn it back on.

Tags: Firefox

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