uncommenting a commented line will double comment line

[Dbz]

I have these lines in my .vimrc file:

"" Set the puppet .pp file type
"au BufRead,BufNewFile *.pp set filetype=puppet

I highlight both lines and gc and this is the result:

""" Set the puppet .pp file type
""au BufRead,BufNewFile *.pp set filetype=puppet

I think this is because there is no space between the comment and the first character i.e. ""comment instead of " "comment.