It sounds like something dynamic is rendering at run-time, such as a URL query or Frame ID. This could explain the behavior you're describing, even if the elements themselves remain unchanged. If your app uses frames, see the bottom of this page for troubleshooting tips. If your app renders pages with a dynamic URL portion, such as query, consider changing the Elements Page Compare Mode in Project Settings > Recording Options.
Again, without more information there's no way to determine why that step fails. The Export Result to File feature from the Step Failure Details is the best way to send us that information. If you feel that information is sensitive, attach the resulting .zip file to a support ticket, which is confidential unlike this forum.
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