Difference in form16 (part a) and part b

In Form 16 (Part A) salary paid is shown more than actually paid and shown correct figures in Part B (of Form 16). In 26AS also same higher salary is being reflected as shown in Part A. Due to this there is a mismatch in actually paid salary and shown in 26AS (here shown higher salary amount).

When filling ITR2 salary in different heads total is correct but less than 26AS (and thus not matching).

What should be done while filling ITR2. Please suggest and guide.