I created a table Tbl_Category with an identity column (2001,1) and inserted four records into the table. Up to four rows, it worked fine, when I'm trying to insert a 5th row now, the identity column jumps to a value of 3005. The identity column (3001,1) was assigned to another table Tbl_Subcategory in the same database.
Table structure:

 
     
    