So ideally the machines in the slot casinos games are configured on some feasible winning and some of loosing?

I am not in doubt because there are actually strategies you may apply while using a particular computer system while playing the slot and you won't win and same techniques could be applied when switched over to another computer system and you could win.

From there some players would always assume their luck to be on that particular computer system. So at their unaware some reconfigurations would be done over night where the player comes other time can not be possible to win ahead like the other times.