Data table not matching site

I have an event plugin on two sites. I need to move the data from one site over to the other. At first I used the WordPress export/import tool. This created problems (duplicate events), so I tried replacing the associated data table instead (in php myadmin).

I deleted the data tables (in php myadmin) on the new site and uploaded the data tables from the old site. However, the data is not being reflected on the site. I tried deleting the event data table and the events are still showing up, even with the data table deleted. I tried deleting the plugin and tables again and re-installing. No dice.

When I add an event to the site, it is reflected in the data table. However, if I add an event to the data table, it is not being reflected on the site. It’s like the plugin has a memory of the old data and it will not let go of it.

I don’t have any caching plugins installed. I’ve cleared my browser cache.

I’ve contacted the plugin author, and haven’t gotten a reply yet, but maybe there is a general solution to my specific problem, that someone can help me with here?

Is there some secret plugin cache somewhere that I can force to clear?