The following problems were fixed on January 09, and can be used normally now.
We apologize for any inconvenience this time.

Second report

It has been found that it takes about 2 to 5 hours to reflect the keywords.
The application for the keywords you have entered have been completed successfully.
We are sorry but please wait until the information is reflected on each material on the Content Manager page.
Sorry for the inconvenience.

First report

Dear all contributors

From Wednesday, January 08, 2020, a problem has occurred where the entered keywords disappear after the application for review materials.

We are currently checking the situation, so please refrain from applying for materials review until the correction is completed.

Thank you for your cooperation.
We apologize for any inconvenience this time.

If you have any questions, please do not hesitate to contact us.