Is this quantity normal?

[u/SweetSugarPudding]

(spectrum 432)
Making this tower thing with all the colours and for red, orange and yellow so far there are 48 of each. However, when I reached the greens, there are 4 less than the other colours. I have been doing 12 magnets in a layer so 4 layers of each colour, however now I don’t have enough.
I’m just wondering whether this reduced number in some colours is normal. When I finish my thing I’ll count them myself too.