It is because Carrara's UV doesn't allow for seems to be added to the mesh. I actually address how to deal with this issue in my next UV tutorial #4 which will be out...eventually O
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If you want a basic look at some UV exercises that are are quick and simple, then look at my website for them. http:
www.awbenson.com Each tutorial is object based (means you get a full object at completion) and should be finishable within twenty minutes each. I provide all supporting files and each tutorial can be completed from C3 to C5, even through the tutorial's screenshots are C5P Beta.
If you have questions please contact me about them.