Muftis giving different answers to the same question

Assalam o alaikum
Sometimes the question asked to a mufti who studied in Deoband or at its branch and the same question asked to a different mufti of the same school of thought i.e. either studied in Deoband or at its branch has a different answer, how and why is that. It becomes a litle confusing. Not all the questions has a different answer but some of do has a different answer. Could you please explain and avoid my and other person like me who has the same issue. Thanking You!
Jazzak Allah!