As I'm sure you guessed, I am new to all of this. Can you explain to me how an F6 Savannah and an F2 Jungle Cat/Chausie hybrid make an F3 Savannah/Jungle Cat hybrid? I thought the further away from the serval you go the higher the generation is?
Because for Domestic Wildcats, there is no distinction between breeds. Another reason why they do not register with TICA. Because it would NOT be a F3 "Savannah/Chausie hybrid" but either an F3A Chausie or an F7A Savannah. In their eyes if they meld the two things it can be an F3 plus still use the Savannah label...which in the end is what attracts the buyers.
Simply put, there is not as much of a market for Chausie kittens as Savannah kittens. I do NOT say that as my personal opinion as I think the Chausie breed amazing and some of the Chausies I have seen in the show hall recently are fabulous cats, but in terms of the pet market, the Savannah garners a higher price tag. Especially at the "F2/F3" level. When you searched for your kitten likely you looked for a Savannah kitten not a Chausie. And this has been something I find very misleading about this cattery, they make sales based on a breed name yet they are not actually breeding that breed. They are breeding mixed breed kittens with poly paws, bobbed tails, curled ears and still calling them Savannahs. They market a "wild" look but the Serval is a specific wild appearance.
Now I don't know what your kitten's actual lineage is. One of the Domestic Wildcats we had in Savannah Rescue this year was transferred to Chausie Rescue as we (collectively) decided that it was more a Chausie than a Savannah. If the lineage you were given by Jimmy is correct, then your kitten is more Savannah, but given the drama of this year when many of us called into question that Savannah label, I don't know that I could believe their word on this anymore.