The VF-9, the VF-X-10 and the VF-X-11, otherwise known as "Huh?"

Okay, so I get the whole history about the VF-9 Cutlass and VF-3000 Crusader created by Kawamori for a Bandai model product line that never came to be. So Kawamori reworked the designs and they became Valkyries for Macross video games. Wonderful. Which brings us to the VF-X-10, which as I understand it was the designation for the Cutlass fighter before it was moved over to Macross and became the VF-9. Am I still doing okay here so far?

So then, why does the 1986 line art of the VF-9 Cutlass have the designation "VF-X-11" written on the wing?