Caching mode password change

Hi All,
We run an ldap system to sync passwords across applications, edirectory included.
We have found a groupwise user running in caching mode. Due to password policy the his edirectory password was updated.
Groupwise failed to update its password as its in caching mode, groupwise had to be switched to online mode to allow the new
password to be updated. Then switched back to caching mode.
This seems to be a bit odd, I would think groupwise client would be able acknowledge the password change regardless of which
mode its in.

Groupwise 2014 R2.