diff --git a/four_letter_blocks/__main__.py b/four_letter_blocks/__main__.py
index 614b535..e095dbf 100644
--- a/four_letter_blocks/__main__.py
+++ b/four_letter_blocks/__main__.py
@@ -27,7 +27,7 @@
 from four_letter_blocks.font_list_item import FontListItem
 from four_letter_blocks.line_deduper import LineDeduper
 from four_letter_blocks.main_window import Ui_MainWindow
-from four_letter_blocks.puzzle import Puzzle
+from four_letter_blocks.puzzle import Puzzle, RotationsDisplay
 from four_letter_blocks.puzzle_pair import PuzzlePair
 from four_letter_blocks.puzzle_set import PuzzleSet
 
@@ -401,7 +401,9 @@ def calculate_needed_counts(self) -> typing.Counter[str]:
         front_puzzle, back_puzzle = self.pair_puzzles
         assert front_puzzle is not None
         assert back_puzzle is not None
-        needed_counts = back_puzzle.flipped_shape_counts
+        front_puzzle.rotations_display = RotationsDisplay.FRONT
+        back_puzzle.rotations_display = RotationsDisplay.BACK
+        needed_counts = back_puzzle.shape_counts
         needed_counts.subtract(front_puzzle.shape_counts)
         return needed_counts
 
diff --git a/four_letter_blocks/evo_packer.py b/four_letter_blocks/evo_packer.py
index 7328bbc..490c643 100644
--- a/four_letter_blocks/evo_packer.py
+++ b/four_letter_blocks/evo_packer.py
@@ -279,6 +279,7 @@ def setup(self,
                            shape_counts=shape_counts)
         if fitness_calculator is None:
             fitness_calculator = PackingFitnessCalculator()
+        fitness_calculator.summaries.clear()
 
         self.evo = Evolution(
             pool_size=1000,