Hey, awesome! I'm glad that you're checking this pattern out.
Um, because I wrote the pattern retroactively, I'm guessing that it's a typo, especially since you're working on three needles - it would only follow that after the decreases, you'd have one stitch left on each needle, right? Just run the yarn tail through those last three stitches and pull tight, and I'm sure it'll be fine. I'll fix that right now - thanks for debugging me!