It makes sense. You have a 3b spiral, but you have the width and fatness in your curl of a 3a, and IIRC, your natural state is more 3a-ish when it comes to root curl.
I have 3b curl diameter, but closer to a 3a spiral pattern, especially at my current length. I also have an easy time with root curl, especially at short lengths, which is more a 3b thing. As long as my moisture/protein balance is in check, the root curl is there.
In the end, I guess it isn't all that relevant; curls are curls.