[Plugin: TDO Mini Forms] Throttle rule with 'seconds' not working :(

Hi guys,

Hope someone can help me out here. I want to set some throttle rules using the time limit. I want to use the following throttle rule:

Only 2 ANY submissions per IP per 86400 seconds (=24 hours)

When making 2 submissions it blocks submissions but never unblocks after 24 hours like I entered in the settings.

Have I overlooked something? Do I need to add code to the form hacker?

Million thanks,
Rene