6th gen rockboxed iPod classic won’t show on mac

I did the full installation of rockbox on a windows pc, but my main computer is a Mac, when I plug the iPod on my Mac it just doesn't show/do anything at all. It did recognized onde and I was moving the songs to it, but then it suddenly disconnected and never connected again. after hassling a little it showed up, but it show as if it was 2 disks, like, it shows 2 ipods connected at once and when I unplugged it and check the music files, most of then disappear.

any help? if I do the process entirely on my mac should be a fix? do I need to format to ms-dos first if I do?