What steps will reproduce the problem?
1. Add a multiline list of variable declarations

What is the expected output? What do you see instead?

Expect something like this:
var var1, var2
\t  var3, var4;

Get something like that:
var var1, var2,
var3, var4;

What version of the product are you using? On what operating system?
Latest from here: http://www.vim.org/scripts/script.php?script_id=3081
OS is Windows.