diff --git a/masque/pattern.py b/masque/pattern.py
index ea8fdd5..e515614 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -201,7 +201,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
 
     def __lt__(self, other: 'Pattern') -> bool:
         self_nonempty_targets = [target for target, reflist in self.refs.items() if reflist]
-        other_nonempty_targets = [target for target, reflist in self.refs.items() if reflist]
+        other_nonempty_targets = [target for target, reflist in other.refs.items() if reflist]
         self_tgtkeys = tuple(sorted((target is None, target) for target in self_nonempty_targets))
         other_tgtkeys = tuple(sorted((target is None, target) for target in other_nonempty_targets))
 
@@ -215,7 +215,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
                 return refs_ours < refs_theirs
 
         self_nonempty_layers = [ll for ll, elems in self.shapes.items() if elems]
-        other_nonempty_layers = [ll for ll, elems in self.shapes.items() if elems]
+        other_nonempty_layers = [ll for ll, elems in other.shapes.items() if elems]
         self_layerkeys = tuple(sorted(layer2key(ll) for ll in self_nonempty_layers))
         other_layerkeys = tuple(sorted(layer2key(ll) for ll in other_nonempty_layers))
 
@@ -224,21 +224,21 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
 
         for _, _, layer in self_layerkeys:
             shapes_ours = tuple(sorted(self.shapes[layer]))
-            shapes_theirs = tuple(sorted(self.shapes[layer]))
+            shapes_theirs = tuple(sorted(other.shapes[layer]))
             if shapes_ours != shapes_theirs:
                 return shapes_ours < shapes_theirs
 
         self_nonempty_txtlayers = [ll for ll, elems in self.labels.items() if elems]
-        other_nonempty_txtlayers = [ll for ll, elems in self.labels.items() if elems]
+        other_nonempty_txtlayers = [ll for ll, elems in other.labels.items() if elems]
         self_txtlayerkeys = tuple(sorted(layer2key(ll) for ll in self_nonempty_txtlayers))
         other_txtlayerkeys = tuple(sorted(layer2key(ll) for ll in other_nonempty_txtlayers))
 
         if self_txtlayerkeys != other_txtlayerkeys:
             return self_txtlayerkeys < other_txtlayerkeys
 
-        for _, _, layer in self_layerkeys:
+        for _, _, layer in self_txtlayerkeys:
             labels_ours = tuple(sorted(self.labels[layer]))
-            labels_theirs = tuple(sorted(self.labels[layer]))
+            labels_theirs = tuple(sorted(other.labels[layer]))
             if labels_ours != labels_theirs:
                 return labels_ours < labels_theirs
 
@@ -255,7 +255,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
             return False
 
         self_nonempty_targets = [target for target, reflist in self.refs.items() if reflist]
-        other_nonempty_targets = [target for target, reflist in self.refs.items() if reflist]
+        other_nonempty_targets = [target for target, reflist in other.refs.items() if reflist]
         self_tgtkeys = tuple(sorted((target is None, target) for target in self_nonempty_targets))
         other_tgtkeys = tuple(sorted((target is None, target) for target in other_nonempty_targets))
 
@@ -269,7 +269,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
                 return False
 
         self_nonempty_layers = [ll for ll, elems in self.shapes.items() if elems]
-        other_nonempty_layers = [ll for ll, elems in self.shapes.items() if elems]
+        other_nonempty_layers = [ll for ll, elems in other.shapes.items() if elems]
         self_layerkeys = tuple(sorted(layer2key(ll) for ll in self_nonempty_layers))
         other_layerkeys = tuple(sorted(layer2key(ll) for ll in other_nonempty_layers))
 
@@ -278,21 +278,21 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
 
         for _, _, layer in self_layerkeys:
             shapes_ours = tuple(sorted(self.shapes[layer]))
-            shapes_theirs = tuple(sorted(self.shapes[layer]))
+            shapes_theirs = tuple(sorted(other.shapes[layer]))
             if shapes_ours != shapes_theirs:
                 return False
 
         self_nonempty_txtlayers = [ll for ll, elems in self.labels.items() if elems]
-        other_nonempty_txtlayers = [ll for ll, elems in self.labels.items() if elems]
+        other_nonempty_txtlayers = [ll for ll, elems in other.labels.items() if elems]
         self_txtlayerkeys = tuple(sorted(layer2key(ll) for ll in self_nonempty_txtlayers))
         other_txtlayerkeys = tuple(sorted(layer2key(ll) for ll in other_nonempty_txtlayers))
 
         if self_txtlayerkeys != other_txtlayerkeys:
             return False
 
-        for _, _, layer in self_layerkeys:
+        for _, _, layer in self_txtlayerkeys:
             labels_ours = tuple(sorted(self.labels[layer]))
-            labels_theirs = tuple(sorted(self.labels[layer]))
+            labels_theirs = tuple(sorted(other.labels[layer]))
             if labels_ours != labels_theirs:
                 return False