Multiple Y-axis highchart graphs likely don't render after migration, because the Oracle BI 12c instance does not include the required JavaScript (.js) files. You must copy the files to the instance manually.
\AnalyticsRes
directory on the 11g system.\AnalyticsRes
directory to the 12c \AnalyticsRes
directory:
Parent topic: Troubleshooting a Migrated Oracle BI Instance