@@IDENTITY returns same ID to 2 different callers....

I have this stored procedure that I want to return the LAST PKID for the table it has inserted a new record into...
This works, however I have had issues where 2 different users have the same ID returned to them after calling this....
Why / How can/could this be hapening?

THis is a web application calling the db.... Do not know if this matters...

Thanks in advance
BillyDVd

USE [CustomerIssueDatabase]
GO
 
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		
-- Create date: 
-- Description:	Insert New Problem
-- =============================================
ALTER PROCEDURE [dbo].[InsertNewProblem] 
	-- Add the parameters for the stored procedure here
			@CustomerID int,
			@DateClosed DateTime = null,
			@DateElapsed DateTime = null,
			@EngVin varchar(50) = null,
			@HotLine bit = null,
			@LiveCall bit = null,
			@CallTypeID int = 1,
			@CategoryID int = 1,
			@Regarding varchar(max) = null,
			@Complaint varchar(max) = null,
			@Action varchar(max) = null,
			@Comments varchar(max) = null,
			@TechSupRepID int,
			@Suggestion bit = null,
			@ID int OUTPUT
	
AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;
	
DECLARE @TranCounter INT;
    SET @TranCounter = @@TRANCOUNT;
    IF @TranCounter > 0
        -- Procedure called when there is an active transaction.
        -- Create a savepoint to be able to roll back only the work done in the procedure if there is an error.
        SAVE TRANSACTION ProcedureSave;
    ELSE
    -- Procedure must start its own transaction.
BEGIN TRANSACTION;
    -- Insert statements for procedure here
	BEGIN TRY
	INSERT INTO CustomerProblem
		(	CustomerID ,
			DateClosed ,
			DateElapsed ,
			EngVin ,
			HotLine ,
			LiveCall,
			CallTypeID ,
			CategoryID ,
			Regarding,
			Complaint,
			[Action] ,
			Comments ,
			TechSupRepID ,
			Suggestion,
			Active,
			LastUpdated
			)
	VALUES
		 (
			@CustomerID,
			@DateClosed ,
			@DateElapsed ,
			@EngVin ,
			@HotLine ,
			@LiveCall ,
			@CallTypeID,
			@CategoryID ,
			@Regarding ,
			@Complaint ,
			@Action ,
			@Comments,
			@TechSupRepID ,
			@Suggestion ,
			1,
			GETDATE()
		);
--|=====================	END SQL SATEMENT =======================|--
		-- Get here if no errors; must commit any transaction started in the procedure, but not commit a 
		-- transaction started before the transaction was called.
        IF @TranCounter = 0
            -- @TranCounter = 0 means no transaction was started before the procedure was called.
            -- The procedure must commit the transaction it started.
        COMMIT TRANSACTION;
		SET @ID = @@IDENTITY
	--| Returns the pkid for the output .. |
--|=====================	END TRY	 =========================|--
	END TRY
--|====================================================================================|--
	BEGIN CATCH
		-- An error occurred somewhere in the try block.
		-- An error occurred; must determine which type of rollback will roll
		-- back only the work done in the procedure.
        IF @TranCounter = 0
        -- Transaction started in procedure.
        -- Roll back complete transaction.
			ROLLBACK TRANSACTION;
        ELSE
        -- Transaction started before procedure called, do not roll back modifications made before the procedure was called.
		IF XACT_STATE() <> -1
        -- If the transaction is still valid, just roll back to the savepoint set at the start of the stored procedure.
			ROLLBACK TRANSACTION ProcedureSave;
        -- If the transaction is uncommitable, a rollback to the savepoint is not allowed because the savepoint rollback writes to the log. 
		-- Just return to the caller, who should roll back the outer transaction.
		--|====================================================================================|--
		-- Notify the client by raising an exception with the error details.
        -- After the appropriate rollback, echo error information to the caller.
        DECLARE @ErrorMessage NVARCHAR(4000);
        DECLARE @ErrorSeverity INT;
        DECLARE @ErrorState INT;
 
        SELECT @ErrorMessage = ERROR_MESSAGE();
        SELECT @ErrorSeverity = ERROR_SEVERITY();
        SELECT @ErrorState = ERROR_STATE();
 
        RAISERROR (@ErrorMessage, -- Message text.
                   @ErrorSeverity, -- Severity.
                   @ErrorState -- State.
                   );
	END CATCH
--|====================================================================================|--
END

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