fixed the fix -oops

Author: Gabe Small

Diff for: pandas/core/reshape/reshape.py

@@ -406,13 +406,13 @@ def _repeater(self) -> np.ndarray:
             # Otherwise, we just use each level item exactly once:
             stride = len(self.removed_level) + self.lift
             if self.sort or not self.lift:
-                repeater = np.arange(stride)
+                repeater = np.arange(stride) - self.lift
             else:
                 na_index = (self.index.codes[self.level] == -1).nonzero()[0][0]
                 repeater = np.arange(stride) - self.lift
-                if self.na:
-                    repeater[self.na] = -1
-                    repeater[: self.na] += 1
+                if na_index:
+                    repeater[na_index] = -1
+                    repeater[:na_index] += 1
 
         return repeater