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Thank you for additional information. The problem occurs because you are using text frames inside your document. Currently Aspose.Words does not fully support positioning of text frames upon rendering. Your request has been linked to the appropriate issue. You will be notified as soon as this feature is supported.
As a workaround, you can try avoiding using text frames in your document.
In addition, you should note that text frames are obsolete and are not used very often. You can use TextBoxes instead of frames.