Problem with two identical conceal arguments in the same line

I write and I wish to insert (and then hide) remarks on what I am writing.
So, I tried to become familiar with conceal and came up with the following
lines of code :

- in my .vimrc :
set conceallevel=2

- in my syntax.vim :
syntax match Remark « •R: .*•" conceal containedin=ALL cchar=•
highlight Remark ctermfg=Blue

But I have encountered a (I suppose foreseeable) problem.
If I write a sentence such as :

Once upon a time •R: find another incipit•, there was a king •R: replace by
tycoon• who etc… etc…

The problem is that :

- when the cursor is on that specific line, everything is blue after time
(not included) and before who (ditto).
- when the cursor is on another line, the fragment "there was a king"
disappears

What did I do wrong ?

Thanks in advance



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