Firstly, there isn't a problem here. There is never a guarantee that identity values will not have gaps. Any time there's a insert that rolls back, the identity increments and doesn't go back. Identity values are meaningless numbers, you shouldn't care at all what the values are.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability