Blood group result questions. Correct?

Doctor I did blood test to know my Blood group. The local Lab has shown Blood group result as 👉 A 2 Positive. The same local Lab has did blood group test 9 years ago for me. Then the result was 👉 A 1 positive. How can same Lab give two different types of blood group result for me within a gap of 9 years? Old report is A1 positive and new report is A2 positive. Which is correct? What is the difference and after affects of A1 positive and A2 positive blood group? I am almost an healthy young man. I have mild Asthma . I take medicine for Asthma, I take Stamlo 5mg for slightly High BP and Cetzine for urticaria from November 2011. I am obese, weight 110 kg. So please clarify whether the Lab results can vary for a person's blood group?🤔 Is this Lab result correct? Thanks.