As much as we would LOVE to have everything work as planned, nothing is 100% certain. The ClinCheck, the computer rendition of teeth as they are planned to be treated, is merely a guess (a very EDUCATED guess) on how teeth move. It is not unusual for teeth to NOT move as planned, so a "mid course correction" is done (new impressions and new aligners).
It sounds as if you did Invisalign Express, where 10 aligners or less are used. This is at a discounted fee, but comes with some risks. Invisalign regular allows mid course corrections at no charge, Invisalign Express does not.
It is likely more treatment is needed. More aligners, removable retainers, brackets and wires or porcelain veneers should be part of the discussion.