Don't know . . .
However, the Super Sweet 100 is kind of a peculiar tomato in that it does grow like straight-up! It is one of the most difficult tomatoes I grow because of that tendency to skyrocket as a plant start. Some of the others want to grow tall, especially in my crowded greenhouse conditions but Super Sweet 100 outperforms them all.
I have been wondering why it is recommended for hanging baskets. I don't grow tomato plants like that but what must this thing be doing?! Shoot up, then drop from it's own weight? I can imagine that it would end up on the floor and trailing away off the edge of the deck! Maybe I'm wrong. I've had them in the garden for several years and they just make a big plant and produce lots & lots of cherry tomatoes. At maturity, there isn't any rocket fire from their corner of the tomato patch. . .
What you might have there, Daisy, is a parent. I really don't know but if the hybridizing wasn't done, the self-pollinating mother plant would have produced a fruit with seed 100% of her own. One fruit, dozens of seed - contaminating the packets. Or, it may be a mutant and not behaving like either parents or offspring.
BTW - I grew regular Sweet 100's for several years. Then, Sweet Million came out so, I tried that one, became discouraged and didn't go back to the type until the "Supers" came out. You can still buy the seed for the regular Sweet 100 from Tomato Growers Supply but I don't know if anyone else carries it . . . (Now you can tell me that I'm completely off-base assuming it came out of "Super" packet of seed :/.
Steve