Invalid characters even after manual update in database

RFC1807 and OAI_DC formats are indicating the presence of invalid characters in journal sections. We have already performed the exchange of invalid characters via the interface and manually in the database, but the characters continue to be listed. Can help me?
Thanks

OJS version 2.4.8.4

Access: https://siaiap32.univali.br/seer/index.php/index/oai

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Hello @Marcelo_Palmito,

Please note that the version of OJS that you’re using is no longer maintained or supported by PKP. I recommend that you upgrade to the newest version of OJS. However, other community members may wish to offer assistance with your question.

You may find the following resources helpful in preparing for and performing the upgrade:

These resources will introduce you to OJS 3 and how it is different from OJS 2:

Best regards,

Roger
PKP Team