Thanks for your patience. Please note these bars are displayed whenever content of the document differs in original revision compared to current. If revisions are accepted or rejected then bars are not displayed because there are no differences remaining in the document. However accepting/rejecting revisions apparently changes document content by either removing or adding changes as per revisions.
However, you can configure RevisionOptions to hide these bars. Please check following sample code, it will resolve the issue.
Aspose.Words.Document doc = new Aspose.Words.Document("DT617_test.docx");
RevisionOptions ro = doc.LayoutOptions.RevisionOptions;
ro.ShowRevisionBars = false;