Slots are mostly (fully?) about chance. Streaks of wins and losses can make it feel like something is “wrong,” but in reality, the outcome is impossible to predict. Sometimes it seems like the system is against the player, but it’s just how probability works. As it is hard for us humans to accept chaos, to accept randomness, we are trying to rationalize it, to find patterns and reasons behind them.
Slot machines are made for entertainment, not for earning money. Which is why it's important to set limits, stay calm, and enjoy the game, with occasional the wins.
All slot machines are programmed with an algorithm that pays out a certain percentage of the money already put into them, and winnings are distributed randomly. That’s why it’s unlikely you’ll ever spot any kind of system in how payouts are made. The only sure thing is that the program in the machine will never pay out more money than it has in the system. Of course, everyone hopes that their bet will trigger the system and hit the jackpot, but realistically, the amount you win in slots is unlikely to exceed what you’ve already spent overall, at least not in the long run. Slot machines are a form of entertainment, not a way to make money, and the attitude toward them should reflect that.