diff --git a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitChunk_1_11_Copy.java b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitChunk_1_11_Copy.java
index 765bc6f2..28d2e224 100644
--- a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitChunk_1_11_Copy.java
+++ b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitChunk_1_11_Copy.java
@@ -42,10 +42,10 @@ public class BukkitChunk_1_11_Copy extends BukkitChunk_1_11 {
 
         this.ids[i] = combined = new char[4096];
         for (int j = 0, k = 0; j < 2048; j++, k += 2) {
-            combined[k] = (char) ((idsBytesArray[k] << 4) + (datasBytesArray[j] & 15));
+            combined[k] = (char) (((idsBytesArray[k] & 0xFF) << 4) + (datasBytesArray[j] & 15));
         }
         for (int j = 0, k = 1; j < 2048; j++, k += 2) {
-            combined[k] = (char) ((idsBytesArray[k] << 4) + (datasBytesArray[j] >> 4));
+            combined[k] = (char) (((idsBytesArray[k] & 0xFF) << 4) + ((datasBytesArray[j] >> 4) & 15));
         }
         return combined;
     }
diff --git a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitQueue_1_11.java b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitQueue_1_11.java
index bf22535e..b9e17bdd 100644
--- a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitQueue_1_11.java
+++ b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_11/BukkitQueue_1_11.java
@@ -573,7 +573,7 @@ public class BukkitQueue_1_11 extends BukkitQueue_0<Chunk, ChunkSection[], Chunk
                     }
                     int x = ((int) Math.round(ent.locX) & 15);
                     int z = ((int) Math.round(ent.locZ) & 15);
-                    int y = (int) Math.round(ent.locY);
+                    int y = ((int) Math.round(ent.locY) & 0xFF);
                     int i = FaweCache.CACHE_I[y][z][x];
                     char[] array = fs.getIdArray(i);
                     if (array == null) {
diff --git a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java
index 8c12572e..9412193b 100644
--- a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java
+++ b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java
@@ -271,7 +271,7 @@ public class BukkitQueue17 extends BukkitQueue_0<Chunk, ChunkSection[], ChunkSec
                     }
                     int x = ((int) Math.round(ent.locX) & 15);
                     int z = ((int) Math.round(ent.locZ) & 15);
-                    int y = (int) Math.round(ent.locY);
+                    int y = ((int) Math.round(ent.locY) & 0xFF);
                     int i = FaweCache.CACHE_I[y][z][x];
                     char[] array = fs.getIdArray(i);
                     if (array == null) {
diff --git a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_8/BukkitQueue18R3.java b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_8/BukkitQueue18R3.java
index cae8120d..e881a679 100644
--- a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_8/BukkitQueue18R3.java
+++ b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_8/BukkitQueue18R3.java
@@ -271,7 +271,7 @@ public class BukkitQueue18R3 extends BukkitQueue_0<Chunk, ChunkSection[], ChunkS
                     }
                     int x = ((int) Math.round(ent.locX) & 15);
                     int z = ((int) Math.round(ent.locZ) & 15);
-                    int y = (int) Math.round(ent.locY);
+                    int y = ((int) Math.round(ent.locY) & 0xFF);
                     int i = FaweCache.CACHE_I[y][z][x];
                     char[] array = fs.getIdArray(i);
                     if (array == null) {
diff --git a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_9/BukkitQueue_1_9_R1.java b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_9/BukkitQueue_1_9_R1.java
index 55fb3f94..3a585895 100644
--- a/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_9/BukkitQueue_1_9_R1.java
+++ b/bukkit/src/main/java/com/boydti/fawe/bukkit/v1_9/BukkitQueue_1_9_R1.java
@@ -533,7 +533,7 @@ public class BukkitQueue_1_9_R1 extends BukkitQueue_0<Chunk, ChunkSection[], Chu
                     }
                     int x = ((int) Math.round(ent.locX) & 15);
                     int z = ((int) Math.round(ent.locZ) & 15);
-                    int y = (int) Math.round(ent.locY);
+                    int y = ((int) Math.round(ent.locY) & 0xFF);
                     int i = FaweCache.CACHE_I[y][z][x];
                     char[] array = fs.getIdArray(i);
                     if (array == null) {