Grove Pi is not detected when connected to Raspberry Pi 4

Hello,

I have came across with a weird glitch.

When I connect Grove Pi to Raspberry Pi 4 and then power up the Raspberry, Grove Pi is not detected also not communicating.

However, if I power up the Raspberry Pi and then connect the Grove Pi, it is detected and communicating.

What may be causing this? If I use it like that, will I encounter with any problems?

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