If and Statements - order of true or false values

I'm using if/and statements.

With the attached spreadsheet, if Cell E6 AND column D6 meet both criteria I set, I want the return to be the result of a calculation, and left blank if neither of the criteria are met.

This works fine for row 1 in my sheet; The year is 2019 (I have asked it to look for 2021), and although there is something in column D, a blank is returned. This is what I'm after.

However for row 2, applying the same if/and formula, when both criteria are met - i.e. the year is 2021 and there is also something in column D, it still returns a blank.

In row 3, I have switched the "value if True" and "value if False" and the calculation works.

My simple understanding of IF/AND is it both criteria are met I want it to do this (value if true), but if they're not both met (value if false), then I want it to do that. Have I got this wrong? Why can't I get the if/and to work?

N.B My attachment is a very simplified version of my actual working sheet. To simplify the calculation require imports minus exports = balance.

Thank you.

This exercise started because I particularly want the cells to stay blank instead of returning a zero if one of the elements is not available. After a number of searches, I came across IF(AND).

The weird thing was that even when I did remove one of the elements of data to test the sample, the function still didn't seem to work.

However, your answer made me look at my data again and I've decided that I can remove the lines with 2019 data anyway.

And now by telling the IF(AND) to look for "" rather than a particular value in the cells it works.

Thank you once again.