Please Check where you add/edit products in the Admin to see if you set up a return URL that is different than where you want the buyer to be sent to. That return will override the return URLs you set up in the Return page.
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Please Check where you add/edit products in the Admin to see if you set up a return URL that is different than where you want the buyer to be sent to. That return will override the return URLs you set up in the Return page.