About high and normal RBC in thal minor

Why there are minor thalassemia
patients who have high RBC but
also anyone have a normal RBC?
Can anyone explain? Thank you.

I don't understand the question. How can it be both high and normal?

Sorry andy if the construction of
a sentence is difficult to
understand. Because English is
not the language of everyday in
my country. I mean, why is there
a minor thal patients had high
RBC? But why there is also a
minor thal patients who had
normal RBC? For example, in my
case quite high RBC. But there
are cases in other patients with
normal RBC. That was why?
Thank you.