That room is classified as Savanna View. Upgrades like that happen from time to time. Not often but they do happen.
Of course, you may also want to double check your point balance and make sure they didn't charge you for savanna view. There have been reports of members being asked at check-in if they would prefer a Savanna View. They thought they were being offered a free upgrade, only to later find that they had been charged the additional points.
Several Savanna View rooms have been reclassified as Standard View. They are rooms with a very limited or obstructed view of the savanna. Typical examples are rooms on the inner corners of the spokes and rooms next to emergency exits where the exit stairs jut out past the adjacent room's balcony, blocking the view.
The downside to this reclassification is that the point costs for Savanna View 1BRs went up for every season to compensate.
I've been trying to track the reports. I've noted the following reclassified rooms reported so far (and the DIS'ers who have provided the info):
5203: studio, Lobby area, Sunset side (hansel1)
5528: studio, Uzima, in a corner next to last spur (b-1)
5238: dedicated studio by a stairwell, Sunset (Anal Annie)
5257: Studio, Sunset, near inside corner inside first spur, people pen view (NHGoofy)
5544: 1BR, Uzima, in a corner on inside of last spur (TwinsFan)
5545: Studio, Uzima, near a corner on outside of last spur (KAT4DISNEY)
5549: 1BR, Far side of last spur off Zebra Trail, near fence between Arusha and Uzima (mousefan1972)
1BR located above the check-in desk (Magic3forme, room number not provided)