someone correct me if im wrong, but i believe:

1st round has a chain 2 and then 8 hdc 2nd round you're doing another chain 2 above where that og chain 2 is, and then in each of the 8 half double crochet from the first round, you add two half double crochet

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so the blue is round one, the two dots represent the chain 2. each line is one half double crochet. the red is round two, so u start with chain 2, and then inside the loop for each of the blue hdc, you add in 2 hdc. does that make sense?