diff --git a/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BlockStatePopulator.java b/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BlockStatePopulator.java
index 240b48159..9574a2fc8 100644
--- a/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BlockStatePopulator.java
+++ b/Bukkit/src/main/java/com/plotsquared/bukkit/generator/BlockStatePopulator.java
@@ -67,7 +67,7 @@ final class BlockStatePopulator extends BlockPopulator {
         final ChunkWrapper wrap = new ChunkWrapper(area.getWorldName(), source.getX(), source.getZ());
         final ScopedQueueCoordinator chunk = this.queue.getForChunk(wrap.x, wrap.z,
                 com.plotsquared.bukkit.util.BukkitWorld.getMinWorldHeight(world),
-                com.plotsquared.bukkit.util.BukkitWorld.getMaxWorldHeight(world)
+                com.plotsquared.bukkit.util.BukkitWorld.getMaxWorldHeight(world) - 1
         );
         if (this.plotGenerator.populateChunk(chunk, area)) {
             this.queue.enqueue();
diff --git a/Bukkit/src/main/java/com/plotsquared/bukkit/queue/BukkitQueueCoordinator.java b/Bukkit/src/main/java/com/plotsquared/bukkit/queue/BukkitQueueCoordinator.java
index e104b80e8..d580719ce 100644
--- a/Bukkit/src/main/java/com/plotsquared/bukkit/queue/BukkitQueueCoordinator.java
+++ b/Bukkit/src/main/java/com/plotsquared/bukkit/queue/BukkitQueueCoordinator.java
@@ -134,7 +134,7 @@ public class BukkitQueueCoordinator extends BasicQueueCoordinator {
                 int sx = blockVector2.getX() << 4;
                 int sz = blockVector2.getZ() << 4;
                 if (isRegenChunk) {
-                    for (int layer = (getWorld().getMinY() >> 4); layer < (getWorld().getMaxY() >> 4); layer++) {
+                    for (int layer = (getWorld().getMinY() >> 4); layer <= (getWorld().getMaxY() >> 4); layer++) {
                         for (int y = 0; y < 16; y++) {
                             for (int x = 0; x < 16; x++) {
                                 for (int z = 0; z < 16; z++) {
diff --git a/Bukkit/src/main/java/com/plotsquared/bukkit/queue/GenChunk.java b/Bukkit/src/main/java/com/plotsquared/bukkit/queue/GenChunk.java
index 9c20d0c6d..1fab185c3 100644
--- a/Bukkit/src/main/java/com/plotsquared/bukkit/queue/GenChunk.java
+++ b/Bukkit/src/main/java/com/plotsquared/bukkit/queue/GenChunk.java
@@ -172,7 +172,7 @@ public class GenChunk extends ScopedQueueCoordinator {
      */
     public boolean setBiome(int x, int z, @NonNull Biome biome) {
         if (this.biomeGrid != null) {
-            for (int y = getMin().getY(); y < getMax().getY(); y++) {
+            for (int y = getMin().getY(); y <= getMax().getY(); y++) {
                 this.setBiome(x, y, z, biome);
             }
             return true;
diff --git a/Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitWorld.java b/Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitWorld.java
index 0f2ed2556..1f8045f7d 100644
--- a/Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitWorld.java
+++ b/Bukkit/src/main/java/com/plotsquared/bukkit/util/BukkitWorld.java
@@ -120,7 +120,7 @@ public class BukkitWorld implements World<org.bukkit.World> {
 
     @Override
     public int getMaxHeight() {
-        return getMaxWorldHeight(world);
+        return getMaxWorldHeight(world) - 1;
     }
 
     @Override
diff --git a/Bukkit/src/main/java/com/plotsquared/bukkit/util/ContentMap.java b/Bukkit/src/main/java/com/plotsquared/bukkit/util/ContentMap.java
index 542557492..0a9130e0c 100644
--- a/Bukkit/src/main/java/com/plotsquared/bukkit/util/ContentMap.java
+++ b/Bukkit/src/main/java/com/plotsquared/bukkit/util/ContentMap.java
@@ -135,7 +135,7 @@ public class ContentMap {
     }
 
     private void saveBlocks(BukkitWorld world, int x, int z, int offsetX, int offsetZ) {
-        BaseBlock[] ids = new BaseBlock[world.getMaxY() - world.getMinY()];
+        BaseBlock[] ids = new BaseBlock[world.getMaxY() - world.getMinY() + 1];
         for (short yIndex = 0; yIndex <= world.getMaxY() - world.getMinY(); yIndex++) {
             BaseBlock block = world.getFullBlock(BlockVector3.at(x, yIndex + world.getMinY(), z));
             ids[yIndex] = block;
diff --git a/Core/src/main/java/com/plotsquared/core/generator/HybridUtils.java b/Core/src/main/java/com/plotsquared/core/generator/HybridUtils.java
index 74e86afaa..9e33ae70d 100644
--- a/Core/src/main/java/com/plotsquared/core/generator/HybridUtils.java
+++ b/Core/src/main/java/com/plotsquared/core/generator/HybridUtils.java
@@ -215,8 +215,8 @@ public class HybridUtils {
                     int xx = chunkBlockX + x;
                     for (int z = minZ; z <= maxZ; z++) {
                         int zz = chunkBlockZ + z;
-                        for (int yIndex = 0; yIndex < minHeight; yIndex++) {
-                            int y = yIndex - minHeight;
+                        for (int yIndex = 0; yIndex < height; yIndex++) {
+                            int y = yIndex + minHeight;
                             BlockState block = queue.getBlock(xx, y, zz);
                             int xr = xb + x;
                             int zr = zb + z;