Standby comes up with old configs

you may want to try the same procedure but this time via the CLI and after having the the config sync command issued, try a "b load".

Command line operations sometimes give us more information than the GUI. On the other hand, remember b load is able to note something wrong in the config file and avoids loading it to the RAM. It's possible that the config is being synced from active unit but it's not loaded to RAM due to some errors or bad sintax.

good luck!

HH