I agree that it looks very tall, but I find it hard to believe that such experienced ship builders have made any rudimentary mistakes with regards to centre of gravity.

Those pictures are at an angle, by the way. Here is a page where the beam to height ratio is easier to see:

http://www.netmarine.net/bat/tcd/mistral/caracter.htm

The french carrier has high centre of weight also but i guess it never ran into any serious problems…