Have you play 1 match with all soldiers? I suggest to try CE table ( any with "soldiers Xp" ), be sure that soldier Xp don't exced 48004, if is higher turn it to "48004" and give a look if your prestige is realy "10", if not you had to play with missed soldier. Don't change manualy prestige before that. If will not help back your prestige to "3"