Check only for current event material

Signed-off-by: Etzelia <etzelia@hotmail.com>

src/main/java/xyz/etztech/minealert/listeners/BlockBreakListener.java

@@ -98,7 +98,7 @@ public class BlockBreakListener implements Listener {
 
         int strikes = 0;
         for (BlockEvent e : map.getOrDefault(event.getPlayer(), new ArrayList<>())) {
-            if (e.isParent()) {
+            if (e.isParent() && e.getMaterial().name().equals(event.getMaterial().name())) {
                 strikes++;
             }
         }