Regression after v2.13.5 - Cursor jumps around at some specific values
When picking gray values very close to white, the cursor jumps to irrelevant colors at some places.

This issue is still present in 3.0 betas from what I see.

This is a working barebones example with v2.13.5
https://codesandbox.io/s/l46ynywk7m

And the same example with v2.13.7 (same behaviour persists in all future versions)
https://codesandbox.io/s/8n7nm221w2

**Gifs showing behaviour:**
Working as expected (v2.13.5):

![working](https://user-images.githubusercontent.com/121476/46532111-4dcad700-c8a8-11e8-9ffe-944261b2b987.gif)

The issue (v2.13.7+):

![not_working](https://user-images.githubusercontent.com/121476/46532132-5c18f300-c8a8-11e8-9ce3-b1e1574961b0.gif)

This also happens in other pickers, not just the Chrome one.

