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I tried to export, and it also export invicible layers, bug?
No. It is intended. All layers are exported as visible except for rollover and popup layers. This was discussed on this forum in detail. But in short - when you work on your design you may hide some layers to make your work easier. If open html preview in a process, you don't need to turn them on and off again. Another reason is that in multipage design you may have some layers hidden on some pages and it's hard to make sure they are are all set correctly when you export entire site. This way you can be sure that you export correct pages no matter what you do with your layers visibility.