Identity column value suddenly jumps to 1001 in sql server

No i havent made any changes

USE [GroupSavings]
GO

/****** Object: Table [dbo].[tblUsers] Script Date: 26-05-2015 15:33:22 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[tblUsers](
[UserId] [int] IDENTITY(1,1) NOT NULL,
[FirstName] [varchar](50) NOT NULL,
[LastName] [varchar](50) NOT NULL,
[EmailAddress] [nvarchar](100) NOT NULL,
[UserName] [nvarchar](20) NOT NULL,
[Password] [nvarchar](15) NOT NULL,
[Gender] [int] NULL,
[RoleId] [int] NOT NULL,
[MobileNumber] [varchar](15) NULL,
[Address1] [varchar](max) NULL,
[Address2] [varchar](max) NULL,
[Pincode] [varchar](15) NULL,
[CityName] [varchar](50) NULL,
[StateId] [int] NULL,
[CountryId] [int] NULL,
[ContributionStartDate] [datetime] NULL,
[TimeStamp] [datetime] NULL CONSTRAINT [DF__tblUsers__TimeSt__173876EA] DEFAULT (getdate()),
[DataForYear] [int] NULL CONSTRAINT [DF__tblUsers__DataFo__182C9B23] DEFAULT (datepart(year,getdate())),
[IsActive] [bit] NULL CONSTRAINT [DF__tblUsers__IsActi__1920BF5C] DEFAULT ((1)),
[IsDeleted] [bit] NULL CONSTRAINT [DF__tblUsers__IsDele__1A14E395] DEFAULT ((0)),
[Photo] [nvarchar](100) NULL,
[IsActiveForTrip] [bit] NULL,
[IsAdmin] [bit] NULL,
[TeamId] [int] NULL,
CONSTRAINT [pk_UserId] PRIMARY KEY CLUSTERED
(
[UserId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [uk_Email] UNIQUE NONCLUSTERED
(
[EmailAddress] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [uk_UserName] UNIQUE NONCLUSTERED
(
[UserName] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[tblUsers] WITH CHECK ADD CONSTRAINT [fk_tblUserDetails_tblTeamDetails_TeamId] FOREIGN KEY([TeamId])
REFERENCES [dbo].[tblTeamDetails] ([TeamId])
GO

ALTER TABLE [dbo].[tblUsers] CHECK CONSTRAINT [fk_tblUserDetails_tblTeamDetails_TeamId]
GO

ALTER TABLE [dbo].[tblUsers] WITH CHECK ADD CONSTRAINT [fk_tblUsers_tblCountries_CountryId] FOREIGN KEY([CountryId])
REFERENCES [dbo].[tblCountries] ([CountryId])
GO

ALTER TABLE [dbo].[tblUsers] CHECK CONSTRAINT [fk_tblUsers_tblCountries_CountryId]
GO

ALTER TABLE [dbo].[tblUsers] WITH CHECK ADD CONSTRAINT [fk_tblUsers_tblStates_StateId] FOREIGN KEY([StateId])
REFERENCES [dbo].[tblStates] ([StateId])
GO

ALTER TABLE [dbo].[tblUsers] CHECK CONSTRAINT [fk_tblUsers_tblStates_StateId]
GO