Differences between SQL Server 2005 and 2008 when updating values

The situation is this: I am making system for synchronizing databases between separate locations. So I created program that creates triggers for update and delete operations on those tables that are defined to be subject of synchronization. The inserts are taken care of with timestamp.

This works perfectly with SQL Server 2008, however users of our ERP system also use SQL Server 2000 and SQL Server 2005. So I tested my system in those environments also, and to my surprise, I found out that updating a primary key or a part of the primary key with the same value, triggers my triggers on tables that have this key as their foreign key. This does not happen in SQL Server 2008.

Just in case I did not made myself clear, say table1 has a primary key pk1 and Table2 has pk2 but also fk1 which references the pk1 from t1. Both have triggers on update and on delete. If I write update table1 set pk1='123' where pk1='123'

In sql server 2008 I only get

(1 row(s) affected)

In sql server 2005 I get :

(3194 row(s) affected)

(1 row(s) affected)

where 3194 was a number of rows in table2 that had 123 as its foreign key.

Does anybody knows why this happens this way?

Matt W edit -> posting of re-pro code from below:

SET ANSI_NULLS ON;
GO
SET QUOTED_IDENTIFIER ON;
GO
CREATE TABLE zReplikacija (
  ID          INT           IDENTITY (1, 1) NOT NULL PRIMARY KEY CLUSTERED,
  Tabela      VARCHAR (MAX),
  Transakcija VARCHAR (MAX)
) ON [PRIMARY];
GO
CREATE TABLE [dbo].[FA1] (
  [Kon_broj]      INT       NOT NULL,
  [Tip_sif]       INT       NULL,
  [Kon_sint]      INT       NOT NULL,
  [RedosledVreme] TIMESTAMP NULL,
  [Redosled]      INT       IDENTITY (1, 1) NOT NULL,
  PRIMARY KEY CLUSTERED ([Kon_broj] ASC) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY];
GO
CREATE TRIGGER [dbo].[trAB_FA1_Update]
  ON [dbo].[FA1]
  FOR UPDATE
  AS IF EXISTS (SELECT *
                FROM   inserted AS i
                       INNER JOIN
                       deleted AS d
                       ON i.Kon_broj != d.Kon_broj)
       BEGIN
         INSERT INTO zReplikacija (Tabela, Transakcija)
         SELECT 'FA1', 'WHERE Kon_broj = ''' + Kon_broj + ''''
         FROM   deleted;
       END
GO
CREATE TABLE [dbo].[FAStavka] (
  [TipStavkeF]    int NOT NULL,
  [R_brojF]       int     NOT NULL,
  [Duguje]        MONEY               NULL,
  [Kon_broj]      int   NULL,
  [RedosledVreme] TIMESTAMP           NULL,
  CONSTRAINT [PK__FAStavka__7A3223E8] PRIMARY KEY NONCLUSTERED ([TipStavkeF] ASC, [R_brojF] ASC) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY];
GO
ALTER TABLE [dbo].[FAStavka] WITH CHECK
  ADD FOREIGN KEY ([Kon_broj]) REFERENCES [dbo].[FA1] ([Kon_broj]) ON DELETE NO ACTION ON UPDATE CASCADE;
GO
CREATE TRIGGER [dbo].[trAB_FAStavka_Update]
  ON [dbo].[FAStavka]
  FOR UPDATE
  AS IF EXISTS (SELECT *
                FROM   inserted AS i
                       INNER JOIN
                       deleted AS d
                       ON i.R_brojF != d.R_brojF
                          OR i.TipStavkeF != d.TipStavkeF)
       BEGIN
         INSERT INTO zReplikacija (Tabela, Transakcija)
         SELECT 'FAStavka', 'WHERE R_brojF = ' + CAST (R_brojF AS VARCHAR) + ' AND TipStavkeF = ''' + CONVERT([varchar], TipStavkeF) + ''''
         FROM   deleted;
       END
GO
INSERT INTO [dbo].[FA1] ([Kon_broj], [Kon_sint])
SELECT [object_id], 0 FROM [sys].[objects]
GO
INSERT INTO [dbo].[FAStavka] ([TipStavkeF], [R_brojF], [Kon_broj])
SELECT [object_id], [column_id], [object_id] FROM [sys].[columns]
GO
UPDATE [dbo].[FA1] SET [Kon_broj] = OBJECT_ID('[dbo].[FA1]') WHERE [Kon_broj] = OBJECT_ID('[dbo].[FA1]')