Nice job with that. I'm rather impressed and think it looks pretty good.
My previous post was a list of possibilities and certainly nothing to note as gospel.
If you've only had him a short time, he could just be getting comfortable and feels safe enough to move around.
Josh has some good info too. I believe there are a lot of "ideas" on how to do things because there is probably no 100% right way. We do our best to provide the right climate, food, shelter and options.
If you are able to get them to eat and show growth, good sheds and if you become interested, get them to breed, you are usually with in the range of doing it properly.