I have the following code in which data act as top sequence which execute other sequences and I am using this offset to pass it to another child sequence

Class Data ;
  randc bit [1:0] offset ;
   
  virtual task body () ;
    for (int i=0; i<4 i++) begin
      this.randomize ();
      $display ("value of offset=%0b",offset);
      <executing another sequence which take offset as an input > 
    end
  endtask
endclass

the problem is that this offset output is not randomized as cyclic at all , some values are repeated without providing all values for offset.