vimrc ignores formatoptions

Hi-

in my ~/.vimrc file I have:

:set ts=4
:set nobackup
:set ai
:set nocindent
:set nosi
:set fo-=r
:set ruler
:set tags=./tags

yet when I edit a file with vim and type:
:set fo
I see formatoptions=croql

which vi produces:
vi /usr/bin/vim

When I change ts=8 and re-run vi, it changes, so it appears
its reading my file but ignoring 'fo'. Can someone tell me how
to fix this or why its happening? Maybe its a bug?

Thanks

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