diff --git a/src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java b/src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java
index 7be781b5..5b770865 100644
--- a/src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java
+++ b/src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java
@@ -936,7 +936,7 @@ public class PlayerData extends OfflinePlayerData implements Closable, Experienc
      * checks if they could potentially upgrade to one of these
      *
      * @return If the player can change its current class to
-     *         a subclass
+     * a subclass
      */
     public boolean canChooseSubclass() {
         for (Subclass subclass : getProfess().getSubclasses())
diff --git a/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceItem.java b/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceItem.java
index 1504c000..768dd678 100644
--- a/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceItem.java
+++ b/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceItem.java
@@ -5,6 +5,7 @@ import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.quest.trigger.Trigger;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import org.apache.commons.lang.Validate;
+import org.bukkit.Bukkit;
 import org.bukkit.configuration.ConfigurationSection;
 
 import java.util.ArrayList;
@@ -50,7 +51,7 @@ public class ExperienceItem {
         Validate.isTrue(config.contains("triggers"));
         id = config.getName();
 
-        period = config.getInt("period", 0);
+        period = config.getInt("period", 1);
         firstTrigger = config.getInt("first-trigger", period);
         claimChance = config.getDouble("chance", 100) / 100;
         failReduction = config.getDouble("fail-reduction", 80) / 100;
@@ -71,7 +72,7 @@ public class ExperienceItem {
      *         account the randomness factor from the 'chance' parameter
      */
     public boolean roll(int professionLevel, int timesCollected) {
-        int claimsRequired = professionLevel + 1 - (firstTrigger - timesCollected * period);
+        int claimsRequired = (professionLevel + 1 - (firstTrigger + (timesCollected) * period));
         if (claimsRequired < 1)
             return false;
 
diff --git a/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceTable.java b/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceTable.java
index e4dbd0d3..0866aa29 100644
--- a/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceTable.java
+++ b/src/main/java/net/Indyuce/mmocore/experience/droptable/ExperienceTable.java
@@ -4,6 +4,7 @@ import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.experience.ExperienceObject;
 import org.apache.commons.lang.Validate;
+import org.bukkit.Bukkit;
 import org.bukkit.configuration.ConfigurationSection;
 
 import java.util.ArrayList;
@@ -44,6 +45,7 @@ public class ExperienceTable {
      */
     public void claim(PlayerData levelingUp, int professionLevel, ExperienceObject object) {
         for (ExperienceItem item : items) {
+
             int timesClaimed = levelingUp.getClaims(object, this, item);
             if (!item.roll(professionLevel, timesClaimed))
                 continue;