I just bought the Booq Mamba Sleeve for my rMBP, after reading mostly positive reviews about it on here. I have a question though, is it supposed to have ridges on one side? I'm not talking ridges anything like the ones on Booq Viper Sleeve, but they are minimal and you can feel it from the inside. I don't know how to explain it, it's just that one side of the sleeve is not smooth/straight as the other one. So I was wondering if that was normal, or if my sleeve has a defect. I apologize if this post doesn't make any sense, but any help would be greatly appreciated!