The highlight only highlights the first or first and second letterz (if you are fast) of the input text.
Afterward anything you type is ignored.

Also, if you copy paste a string in the input it will be highlighted completely but will ignore anything you type after that string.
This must be related to some kind of timing issue.

Steps to reproduce:

1. On http://selectize.github.io/selectize.js/ Email Contacts example
2. Type "brian"
3. Only "b" or "br" is highlighted

Expected result:
Brian should be highlighted in both the email and the name

Actual result:
Only "b" or "br" is highlighted

Might be related:
The highlight <span class="highlight"> gets wrapped inside other <span class="highlight"> at each new highlight instead of resetting the string.