I'm sure this is simple, but it is not clear to me...

I am copying the contents of a group of cells that exist on one worksheet to
another. In Sheet2, I tell cell A1 that it should equal Sheet1's A1 value.
That works fine. But if the cell is blank on Sheet1, it comes up as "0" on
Sheet2. I figured it was probably assuming numeric formatting, but when I
right-click > format cell on both Sheet1 and Sheet2, both show up as
"general", so why would Sheet2 take a blank value and populate it with "0"
??