I have observed your comments and have worked with the file shared by you. I have been able to reproduce the issues on my end. A ticket with ID SLIDESJAVA-35206 has been logged for the problem of missing border lines and another ticket with ID SLIDESJAVA-35207 has been logged for the problem of the error that PowerPoint detects. This thread has been linked with the issue so that you may be notified automatically as soon as the issue will be fixed.