bug: Fix PatchMerging duplicate merging

Author: pooya-mohammadi

monai/networks/nets/swin_unetr.py

@@ -783,8 +783,8 @@ def forward(self, x):
         x2 = x[:, 0::2, 1::2, 0::2, :]
         x3 = x[:, 0::2, 0::2, 1::2, :]
         x4 = x[:, 1::2, 0::2, 1::2, :]
-        x5 = x[:, 0::2, 1::2, 0::2, :]
-        x6 = x[:, 0::2, 0::2, 1::2, :]
+        x5 = x[:, 1::2, 1::2, 0::2, :]
+        x6 = x[:, 0::2, 1::2, 1::2, :]
         x7 = x[:, 1::2, 1::2, 1::2, :]
         x = torch.cat([x0, x1, x2, x3, x4, x5, x6, x7], -1)
         x = self.norm(x)