I have a simillar problem. I run around with my admin account and plant new hordes. Server displays the same as zkajo gets. Though I just type /createhorde 80 Zombies appear for my admin account but when i log my playeraccount none of the Zs remain.
Just logged on. There is a random person kiting Zs around our base. Dont know if fleeing for life or trying to wreck base. Edit: False alarm. BUT DAMN our place has been looted hard. Little food left and basicly no books and ammo left..