What does it mean if cbc consistently shows low rbc but normal hematocrit and hemoglobin?

Not much: If blood contains normal amount of hemoglobin, it will carry oxygen to tissues and CO2 to lungs normally. If red cells are a little larger than normal, number of red cells ("RBC") could be slightly low. You could have macrocytosis (large cells) without disease, but might want MD to rule out some causes of it (low B12, low thyroid, increased reticulocytes, and others) just to be sure.