Yes, this is something I noticed with several "determinate" or "semi-determinate" types - that there's a base pattern followed by the "terminal bud" pattern, and then another axillary shoot forms and repeats the pattern.
It sounds like your F2 have a diversity of growth habit going on, as I saw in mine.
I've been thinking about different ways of visually representing the patterns (without getting it done to my satisfaction yet); anyway here's one representation of the jagodka pattern in my growout this year.
The "N" column is the number of leaves before the first cluster on the main stem - this I've read elsewhere is under separate genetic control.
My Jagodka had seven leaves, then cluster-leaf-cluster, followed by 5 leaves, cluster - terminal cluster (with a leaf). And the side shoots had the same pattern of 5, cluster-terminal cluster.
I didn't get more repeats on the main stem, but it sure did crank out the side shoots without end.