Database returned to CIRCULAR mode but logs are still being archived to old location
Run GET DB CFG with the SHOW DETAIL option, which will reveal any settings that are delayed (not yet active). Any difference between the "Current" and "Delayed" value indicates a DB CFG change that was made after the database was last activated.

If the old path isn't showing up in any of the settings in the "Current" column of the database config, then examine the logging settings of other local databases on the system (and in other local instances if any exist) to see if they're the culprit.

It also wouldn't hurt to take a look at the crontab schedules on the server to see if a cron job is responsible for copying the files to an inappropriate path.