Disable user account also change the password?

Hello IDM experts,

I am testing the functions of IDM 7.2 and found a strange behaviour.

I disable a user account in IDM UI and it is locked indeed in the ABAP backend. However when I enable the user, I found the password for this user is back to "initial" password. I checked the log and it says "Trigger notification: user changed password."

Is it a feature in design or is there something wrong in my settings?

Thanks!