Salary Discrepancies: Should Your Bank Statements Always Match Form 16?

I worked for a small company for some months. We received some amount in cash and some amount in a check, which means this month I have a salary of 15K. However, due to my employer's bank issue, I did not receive a check, but my MD asked the senior manager to give 12K for this month. For the next month, he wrote a check for 18K and gave it. Ideally, I should be getting a payslip of 18K, but the cash communication was internal, so he gave us a salary slip of 15K for two months. Moreover, the proper amount is reflecting on Form 16.

Should bank statements always match with Form 16?

Should bank statements always match with Form 16? They may not match if there are cash payments. Otherwise, the amounts should tally. However, the Income Tax (IT) department will review the figures of Form 16 as uploaded in Form 26AS. Please check Form 26AS online to see the figures shown there. Also, with the figures displayed as your salary, you may not fall into a taxable bracket.

As my salary was non-taxable, only professional tax is applicable, which will not reflect in IT. Am I right?