It's because they are already filled up for September. They only take 40 students. I think it's a first come, first serve basis. I applied in May and got my acceptance in June for the September start.
I think you will definitely get in, especially if you do well on your hesi (I'd say above an 85 - it's really not that hard to make!) But unfortunately, they are full for the September start which means you will be doing a January start. I graduated with a Bachelors in Kinesiology from TAMU, 3.4 GPA, and a 91 on the HESI and had no issue with getting it.