That was in Multipool and Fastcoin.
So; very low difficulties+big hashrates = orphans
I should choose harder coins next time.
Yes, with your hashrate you can easily mine other low-diff (probably diff between 1 and 10) coins with larger blocktimes. FST is known for that kind of problems.
If you are looking for a good multipool, i.e. for 42coin (less orphans than other pools), I can recommend
Hash to Coins. They don't charge fees and have a good coin selection, you can mine with the autoswitcher or select a certain coin.