Thank you, DeeAnna, for the reply.
It was a total of 169.5g of NaOH, instead of the 139.5g, so an extra 30g. I was supposed to use 279g of the 1:1 lye solution, but used 60 g too much. 279+60=339÷2=169.5g
Given that I used 169g of lye, and not 280, and that I also had an additional liquid...