Confuse at semantics

[Kadu Diógenes]

What this means in zhong: every 1.minute, 'foobar', at: '**:20'

For me it's means that I want to run it each minute in whatever hour, but only when it's 20 minutes, but I see it running every minute in the console:

web_1            | 20:34:19 web.1  | 2017-11-10 20:34:19 +0000: running: foobar
web_1            | 20:34:19 web.1  | "hey joe!!!"
web_1            | 20:35:19 web.1  | 2017-11-10 20:35:19 +0000: running: foobar
web_1            | 20:35:19 web.1  | "hey joe!!!"

Suddenly it stopped running every 1 minute and I see this on '/zhong':

Would love to get an explanation about what is going on.