run 3 lengths of wire round the bobbin at the same time. And join them all at each end.
Here is a picture, very different, but easy to see. Here 5 windings. This is because 5 small wires are easy to bend while one very large wire is hard to bend around.
I can tell that is is high current. High frequency.
You are using 27 x 3 small wires not one very large wire for two reasons.
1) Mechanically easy
2) At high frequency electrons travel on the outside of wires. The inside of the wire is not used. So many small wires have a large amount of outside and little inside.