I registered a term from the Edit page, but the term is not updated.

Phrases are prioritized over Glossary. If the registered term is used in perfect matches from My Phrases and Company Phrases, those segments will not be automatically updated.

Besides, if the newly registered term is a part of the existing term, newly translated term will not be reflected to the existing entry.

また、登録しようとしている用語が既に用語集に登録されている用語の一部である場合は、新しく登録した用語は適用されません。 

For example,
Existing entry in the glossary is "八楽株式会社 "➔ "YARAKU"

The user adds a new term from the edit page as "八楽”➔"Yaraku, Inc.

Existing entry "八楽株式会社 "➔ "YARAKU" will not be replaced with the "Yaraku, Inc."