I noticed when putting the Lippan Indians into a division with other cav units, the nato symbol switches from cav to inf. At first I was afraid that they were actually considered inf for movement and that the picture was wrong, but after checking the stats and testing that they moved mounted like the other cav I realized it was just probably the wrong nato symbol being assigned. No biggie, but it could confuse someone else.
Edit: 1861 April Campaign, v1.12