Gaofen-1 image pansharpening

Hi,
I orthorectified both MUX and PAN products from Gaofen 1 satellite using OTB. I then tried the pansharpening using otbcli_BundleToPerfectSensor, but there is a little misalignment between those two products, and hence the result is unusable. Please see below the snapshot:

Any idea how can I fix this misalignment?

Thanks.
Pritimoy