Hey Luvv_xox the kitti!
Thanks for trying out Like Rabbits!
For your first picture, grey is a less dominant color than black or brown, so it's possible both the brown and black rabbit had a grey (or lighter) hidden gene, allowing the offspring to result in grey.
For the second picture, it does appear that you got the goal rabbit. I wonder if maybe there is a dark spot on the rabbit you made that is not visible but messing up the "same rabbit" detection. I agree that it shouldn't work like that, it should count as having gotten the goal rabbit, and will remove the possibility of this happening again.
I really appreciate the feedback!