It's because you press the unlock button twice or held it down a bit longer than needed.
The feature is not very well known and you're not the first person to come across it. http://www.10thcivicforum.com/forum/169-2016-honda-civic-problems-issues/13129-why-do-windows-my-2016-civic-lx-sedan-open-automatically.html
Hope this helps!
The feature is not very well known and you're not the first person to come across it. http://www.10thcivicforum.com/forum/169-2016-honda-civic-problems-issues/13129-why-do-windows-my-2016-civic-lx-sedan-open-automatically.html
Hope this helps!