diff --git a/src/main/java/land/chipmunk/chipmunkmod/modules/CommandCore.java b/src/main/java/land/chipmunk/chipmunkmod/modules/CommandCore.java
index 86ed3a7..06cdba3 100644
--- a/src/main/java/land/chipmunk/chipmunkmod/modules/CommandCore.java
+++ b/src/main/java/land/chipmunk/chipmunkmod/modules/CommandCore.java
@@ -181,7 +181,7 @@ public class CommandCore implements Listener {
         if (world == null || noPos == null) return;
 
         // also delete the old core
-        if (withPos != null) {
+        if (withPos != null && !isSingleBlock) {
             pendingCommands.add(
                     String.format(
                             "fill %d %d %d %d %d %d air",
@@ -246,7 +246,7 @@ public class CommandCore implements Listener {
         if (player == null || connection == null) return;
 
         final int distanceSquared = player.chunkPosition().distanceSquared(new ChunkPos(origin));
-        final int distance = (int) Math.sqrt(distanceSquared);
+        final int distance = (int) Math.sqrt(Math.abs(distanceSquared));
 
         final int simulationDistance = connection.getLevel().getServerSimulationDistance();