I remember there where a problem before, shutdown leads to reboot. But now it's the opposite - reboot leads to shutdown. Both gui button or:

sudo reboot
reboot
sudo shutdown -r now
sudo init 6

from terminal, or ssh, behave the same. This is on Armbian_5.25_Orangepipc_Ubuntu_xenial_default_3.4.113_desktop / Armbian_5.25_Orangepione_Ubuntu_xenial_default_3.4.113, from download section and self built.

I'm experiencing the same problem on lime2:  reboot results in shutdown.  This is a serious bug/problem for remote operation.  Was not a problem in xenial_next_4.10.14

In my case, it turns to be a problem with sd-card. I knew my card, i used, is semi-broken, but didn't made a glue, until someone (tkaiser i think), mentioned it in other topic. So check your sd-card, first.