Why my update stored procedure return 2 rows affected while there's only one data in table?

I created a strored procedure that can update tables in two different databases.

CREATE PROCEDURE [dbo].[usp_Update] ( @sID VARCHAR(max), @sName VARCHAR(max), @sLocation VARCHAR(max) ) AS BEGIN -- Update table1 in database testDB1 -- UPDATE dbo.table1 SET Name = @sName, Location = @sLocation WHERE ID = @sID -- Update table2 in database testDB2 -- UPDATE testDB2.dbo.table2 SET Name = @sName, Location = @sLocation WHERE ID = @sID END 

table2 contains all data in table1 but not all data in table1 contains in table2.

So, If there's some data in table1 that updated, automatically table2 also updated and if no data in table1 updated, table2 still updated.

There's no error in my queries actually, when I'm tried to update data that only in table2, it returns

(0 row(s) affected)

(1 row(s) affected)

But, every time I tried update data in both tables, it returns

(2 row(s) affected)

(1 row(s) affected)

So, why its said 2 rows affected when there's only one data on table1?