First things first - you definitely DO lose some LBM with weight loss - it's almost inevitable. You can minimize losses as much as possible by maintaining muscle, but higher weights require more muscle to carry them, and also have more of other lean body mass constituents (water, for example). So higher weight generally means a higher lean body mass, and you're definitely going to lose some.
That's probably why you have the additional LBM now...extra skeletal muscle, extra other stuff that came with the extra fat. Shedding fat will also bring your LBM down a bit (though you can maintain some of that new muscle, if you wish, with lifting).
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