There is only a problem if the penitent intended to hide the sin in confession. If the poor presentation was sincerely unintentional, rather than an attempt to conceal the true nature of the sin, then all the sins are forgiven. If the penitent wishes, he may mention the sin in question at the next confession, using a clearer way of describing the sin.
If, on the other hand, the penitent was attempting to conceal the sin, none of the sins confessed were forgiven, and the sin of sacrilege has been added.
People with a scrupulous concscience, however, should not go back and critique their confessions, as it only feeds the obsession. The scrupulous should choose one confessor and obey him in all matters pertaining to conscience.
Betsy