C :: Parsing Binary Data File By Casting A Buffer - Accessing Double From Struct

I am parsing a binary data file by casting a buffer to a struct. It seems to work really well apart from this one double which is always being accessed two bytes off, despite being in the correct place.

Code:

typedef struct InvoiceRow {
uint INVOICE_NUMBER;
...
double GROSS;
...
char VAT_NUMBER[31];
} InvoiceRow;

If I attempt to print GROSS using printf("%f", row->GROSS) I get 0.0000. However, if I change the type of GROSS to char[8] and then use the following code, I am presented with the correct number...

Code:

typedef struct example {
double d;
}

example;
example *blah = (example*)row->GROSS;
printf("%f", blah->d);