Thanks! Does it only happen with specific values for $circle-count? That would be useful for debugging, if you have some time to experiment!

https://jsbin.com/cofege/6/edit?css,output

I updated the screenshot form 1 to 30
http://imgur.com/a/tf0Nf#30

Hope it helps.

Btw, completely unrelated to this bug, but you don’t need that many elements for this effects, you can do it with just one element with a conic gradient, a radial gradient and blending modes: http://codepen.io/leaverou/pen/WvZmrM?editors=010

Also thanks for the updated screenshot!

The pen is so cool and helpful!

ps:
The strange color appear at that pen, when the $n in other number

Yup, I know it happens there too, I was just suggesting a better way for this, regardless of the rounding error that is causing that weird gap for some stop positions.

Here's the most obvious reproduction I was able to find:
https://codepen.io/anon/pen/bvapKd

I'll try to work on a PR fixing this