It is my belief that any verse that has repeating lines, rather than rhyming lines, is a mistake or momentary lapse
on the part of the singer which was then written down by an uninformed collector.
You will find it occurs in many collected shanties, and I try to avoid repeating the repetition, if you see what I mean?
The version above looks very suspect as well.
More like some old seaman making up a vaguely remembered shanty on the spot for the price of a pint,
and to my mind, not worth the price of a glass of tap water.
A shanty for a shandy - bah humbug!

Disgusted of Strood    X (His mark)