I keep hatching the same pet.

I'm not super well versed in W101 pet hatching but at this point I've now hatched 4 of the same pet. I currently have a mystic saber tooth for a pet and am trying to swap to a LiL Medusa. At this point I've tried to hatch it 3 times and i keep getting mystic saber tooth, whats the reason behind this and how do i fix it?