Urgh!!! Same here... the sun is shining outside (for the first time in months!), but all my lamps outside are burning happily... (I'm running hub ver 2.0.9.133)
It is 18:54, the sun is setting at 21:20. The first and last conditions cannot both be true...
EDIT: I noticed that my time was between sunset -20 minutes (21:20 - 20 = 21:00) and 21:00. So I thought maybe that's the problem, it's the same time. I then played with the offstes. >20min gives a false. <20min gives a positive (which isn't correct).
EDIT 2: I have deleted the rule. Everything, including the conditions. Reset the Hub. When I add condition "sunset - 20 min" it shows as TRUE. Sunset is not for two hours...
EDIT 3: I've figured it out. Hubitat doesn't like it when I add a condition "between (sunset - x min) and TIME" where TIME is actually before (sunset - x min). I know it sounds ridiculous, making rules like that, but seeing that the sun sets here at 16:00 during the winter and 22:00 in summertime, it would be nice to set these rules at once, so that it's not necessary to change rules with the seasons... (which is what I'm going to try next - add a condition that it must be between dates where its summer/winter 
)
I still love my Hubitat!
LAST EDIT: (I'm sorry if I talk too much, this is for future reference for people with the same problem) I have solved it by adding the Illuminance variable.
