mysql graphs

I've setup hobbit and the mysql monitoring using the script from deadcat. All is working great except for one thing.

When I click on the 'mysql' bullet in the status display, I get the lastest status message, but no graphs.

If I click on the 'trends' bullet, I get the mysql graphs.

For 'http', the apache graphs appear under both the 'http' and 'trends' bullets.

What would make the mysql graphs appear in 'trends' but not 'mysql'?

Thanks.