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1576 bytes on wire, 790 bytes captured!

I have written a small program which sends 758 bytes to a UDP port. Wireshark reports that the data part of the packet is indeed 758 bytes and the whole packet is 790 bytes, so far so good, but, it's also reporting 1576 bytes on the wire (and the receiving app doesn't like the packet). I figured it must be something in my code, however, it seems fine on other PCs, so it's something wrong with this particular PC running Window 7.

Any ideas what might be the cause?