Why different address number for same partner in LFA1/KNA1/BUT020 table?

I created a business partner with basic attribute like name and address , one entry in BUT020 automatically created with BP and ADRNR (e.g. 23456)

I assigned customer role to BP and saved , Entry in KNA1 created but with a different adrnr (e.g. 23457)

Same way i assigned another role vendor and in lfa1 it exist with a different adrnr (e.g. 23458)

Even though all three adrnr carry same address details , why sap generated 3 different address number instead of having one central address number linked in all 3 tables?

is there any config in BP which i missed?