No, you only resolved those cards that were in your hand at the time. If you drew any corruption cards during play, then those are resolved at the end of *each* player's main phase (to account for drawing cards outside of your turn).
Corruptions drawn outside of your turn are resolved at the start of your turn, per the first rule. The rule to resolve corruptions at the end of your main phase is there so that any corruptions you drew during your turn are automatically resolved before your turn ends. There are a few instances where a player can draw cards on their turn and this is to deal with that.
Hope that clears it up,
Let me know if you have any more questions