trying to figure out if I have a hardware problem - voltage on all pins

Arduino Nano
long story short, I send 0-5v into pin A0
what ever voltage I see... on A0 ...
I see that voltage across all input pins
IF I put 3.3v into A0, I also see it on A1, A2, A3, etc

am I missing something, or is something fried

I understand that there should be some float voltage there when nothing is connected.... I'm not talking about that

May it would be helpful if you could upload your code and connection diagram.

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