Chord pad plays trigger key

Yeah, I’m using cubase 9.5 on windows 10 x64, never have this before I reinstall window.
It plays chord and the trigger note also.
So if I assign C major chord on C1, it doesn’t matter.
However If I assign D major on C1, it’s gonna play D,F#, A and C.
Then it’s gonna be D7…
I attached the photo.
The trigger key is purple


Sorry I’m not sure I understand your report completely.

Does it mean, the source Note (the one which triggers the Chord) is sent thru, and played back too?

What Cubase version exactly, do you run, please? Make sure you have the latest update installed, please.