TinySwitch4 transfomer design

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Hi. I am new at a company and some of the legacy products at this company use the TinySwitch-4 in fly-back topology with the transformer polarity windings from primary to secondary wound in the same direction and voltages in-phase. When I review the TinySwitch-4 datasheet and when I run some designs with PI expert using this same topology, the transformer has the winding polarities between primary and secondary with opposite polarities so voltages are out-of-phase. So as a question, the products do work but what, if any, are there adverse effects that may add stress to components? Does this impact efficiency? Thanks.