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I recently bought a macerater pump (possibly spelled wrong) to drain my black water tank out without needing a dump station. I drained mine, similar to yours black water stopped coming out.
Checking my tank level indicator after, my black tank was still 1/3 full. The only way I got it to drain fully was by pumping water up the drain pipe by shutting the macerater pump off but leaving the water hose running through the pump. Nearest I can guess is something blocked the drain the first time. Perhaps toilet tissue or something, and backfilling it would have broke it loose.
Yours could have done similar and driving home sloshed the contents around enough to clear the drain.
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