Lol good eyes. I would have never noticed. Seems that it is just the way that they lay the carbon fiber and since it is cheap they probably don't have any set guidelines or consistency in batches that they make.
Lets say batch 1 was left --- batch 2 was left --- then some new guy started making batch 3 and went right. Since it is so cheap I think this is the case. Quality wise I do not know. They all look around the same.