I didn't reroll, and I didn't do anything to him. I have a Seal Brown SH that didn't say it had appaloosa as a colt. When he grew up, I just noticed that he had appaloosa. The stable page didn't say he had appaloosa. It has confused me quite a lot. His sire is an appaloosa, but he didn't have appaloosa as a colt. I have no idea what's happening. He was my favourite horse when I had him and I looked at him basically everyday and never saw appaloosa on him.

Here is the horse:

If you can tell me what happened, that'd be great! I don't know if this is an actual bug or not, but I need to know. Thanks!

I am 99.9% sure this isn't a bug, and that he's had appaloosa since he was born and you just failed to notice it in his color description since he isn't visibly appaloosa because he carries no pattern gene.

He's had it since he was born. You probably didn't notice like Idle said since he has no Pattern genes to express it