I have noticed on some of the coats the eyes are white for the equine in genera, because it was a black horse I thought it was to show that they have eyes but then there were horses that were lighter and had the same white eyes while there is also horses in similar shade with black eyes. Just reporting this just incase it is a bug.

Don't worry, not a bug. You actually got a "blind" or "half blind" horse. You can also get horses with gold or brown eyes. :)