could be bad luck... But it could just be the pool and how they represent everyones hashing.
If everyone is shown as lower, then the entire pool should still split blocks proportionately.
I've noticed this across a few pools. Some are representing my hash higher or lower than what my end is saying.
But the end result is about the same over time. Or I suppose, maybe the pool is having issues?
well, there was no correlation between my hash drop and pool's total hash, and no network issues whatsoever, so that's that.
also I was there for a straight month before pointing half of the hash to another pool and eventually switching completely.
now my total average for 24h is 2.5% below the produced (dev fee and all) while at nanopool I reached a point of around 20% missing.
in addition I distinctly remember that they were very 'problematic' with ZEC before flypool was properly setup, also for me ETH was always less profitable with them than with most other pools.