[Orgmode] Two question about org-mode?

[Water Lin]

First, I am using item list like this in my org file:
----------------
1. test
  1) test
  2) test
  3) test

2. test2

3. test3
----------------
I don't know why my webpage looks like this after exported:
----------------
1. test
  1. test
  2. test
  3. test

2. test2
---------------

Why the 1) 2) 3) can't keep the right parenthes in item list order?

The second question, I have some underline in my org text, like
-------
test_src
-------

When I export it to html page, it is converted to subscript characters.
How can I make org not to convert the underline?
-- 
Water Lin's blog: http://blog.waterlin.org
Email: address@hidden
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