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.