Can't create more than one fork

It seems like when you trying to create a new from a twiddle already having one, ember-twiddle simply switches to that fork.

How reploduce:
1) open twiddle (not default) this for example https://ember-twiddle.com/#/eedfd390d8394d54d5bfd0ed988a5d0f
2) create fork, change something and save it
3) open twiddle from 1)
4) create a new fork

**expected**:
- fresh fork, identical to original twiddle from 1)

**reality**:
- old fork from 2)

Since I can give any links I recorded a video.
https://dl.dropboxusercontent.com/u/880075/ember-twiddle.mov
In the video you can see that I got all Application caches flushed (localStorage, cookies ext.)
I also tried Chrome incognito mode and it didn't help