Im mining with 54 mh/s but I get only ~ 55 coins a day.
What to mine shows more is that normal ?
Also the mh/s from the workerscreen is different ?!
It's not normal. Suprnova? It underpays greatly for some time now. 20% less constantly.
Take the value from calculator and apply pool luck and fee to it, if you are getting within 5% of the result then it's ok.
If pool does not display luck then, well, you are out of luck

and can only guess whether it's actually a bad luck or a pool is just stealing your rewards.
Calculators always show more than what you will get. If you subtract 20-40% you will be more correct, at least you won't overcalculate.
Bullshit. This one shows exactly what you should've earned for the past 24 hours with 100% luck, 100% efficiency, stable hashrate and 0% pool fee:
https://nodes.nullspam.ru/signatum/Trust me, I know, I wrote it)) If your reward differs more than 5% after you apply all the above modifiers then you should be worried about your miner/network efficiency or the pool fairness.