No end in sight

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I just checked my Ravelry page and I have been working on this Nuvem wrap for over a year.  It has been an active WIP that whole time, and it is stockinette in laceweight yarn. The pattern is written in terms of percentages and you make a ruffle when there is 20% of the yarn left – for this project that’s 40g.

I swear on all things wooly, the other day I had 106g left to knit, I sat down with this thing for about an hour and a half and when I weighed it again, 109g.  What have I done to offend the knitting gods this time?