For example, zp_table-name became zenphoto_table-name.
Then the update was not done correctly. If present Zenphoto uses the existing config file in `zp-data' and the original databse prefix as set there. If not it creates a new config file and uses the default if you don't set anything else there or on Setup.
Sorry, I have no knowledge or ever used FreeBSD ports. Installation and upgrade is explained here: http://www.zenphoto.org/news/installation-and-upgrading
If you use other tools to install, you probably need to ask the providers of those tools.
Direct updates from such old versions like 1.4.0.4 is not recommended. Please see link above.