folds closed every time I change buffers

Hi,

I recently cleaned up the layout of my .vimrc. I have this in it;

set foldlevel=99

set foldmethod=syntax

let vimsyn_folding='af'       " Vim script

...

set modelines=2

" vim:foldmethod=marker:foldlevel=0

Now, when I open .vimrc, all folds are closed, good. I open a fold, move to another buffer, come back...and all folds are closed again, very annoying. I cannot figure out what is causing this, any ideas?

thanks

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