Filetype error

For the longest of times my .vimrc has looked as follows:

"Because some options may not be vi compatible

set nocompatible

"Turns on filetype plugins

filetype plugin on

filetype indent on

"Ignore case when searching

set ignorecase

set smartcase

"Highlight searches

set hlsearch

"Toggles the highliting off with ctrl+n

:map <silent> <C-n> :set invhlsearch<CR>

"Shows matches as they are found

set incsearch

"Remove trailing whitespace

autocmd FileType c,cpp,java,php,js,python,ruby autocmd BufWritePre <buffer> :call setline(1,map(getline(1,"$"),'substitute(v:val,"\\s\\+$","","")'))

"use spaces instead of tab

set expandtab

set smarttab

"Changes tab amount

set shiftwidth=4

set softtabstop=4

"Maps jj to esc for faster exit of insert modes 

imap jj <Esc>

"Turns on syntax coloring

syntax on

"Enable line numbers

set number

set numberwidth=3

"Normal backspace operation

set backspace=indent,eol,start

But now for some reason whenever I type the comment character for the particular language I am using, the character is repeated on the next line.  For example if i am editing test.cpp if i type:

//Comment

Then press enter the file now looks as follows:

//Comment

//

Through editing out the different options I have boiled the problem down to the filetype plugin on.  And was wondering if anyone knows a fix for this.  And if it helps, my .vim/ftplugin directory is empty.

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