ignore simply jetpack NBT, fixes #758

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/util/Comparer.java

@@ -175,6 +175,10 @@ public class Comparer implements IComparer {
                 case "minecraft":
                     stack.getTagCompound().removeTag("RepairCost");
                     break;
+                case "simplyjetpacks":
+                    stack.getTagCompound().removeTag("sjData");
+                    stack.getTagCompound().removeTag("PackOn");
+                    break;
             }
         }