Programming error on the physical calculator only

[gabrieljcs]

Ok, I renamed the variables but still get the odd behavior. I'm pretty sure I'm missing something really dumb, because this doesn't make sense.

Code:

EXPORT TamanhoMantissa()
BEGIN
  LOCAL SIZE, AUX0, AUX1;

  SIZE := 20;

  REPEAT
    SIZE := SIZE + 1;
    AUX0 := 1/2^SIZE;
    AUX0 := AUX0 + 1;
    AUX1 := AUX0 - 1;
  UNTIL AUX1 == 0;
  
  MsgBox("O tamanho da mantissa é de " + SIZE + " bits");

  RETURN SIZE;

END;