Boss fights not starting when boss hologram says they should - more info

My past report was denied as "unable to reproduce", so I am doing my best to provide further info (as this is potentially a pretty big issue) After a server restart, a boss fight started within 30 mins if i remember. Then, THREE times in a row, the issue occurred. Boss hologram timer counted down from 59 minutes to 0, but no fight started and the timer reset. No players have used boss eggs since the server restart to my knowledge. One time when I witnessed it, It counted down, said "Starting soon", but then reset to 59 minutes and no fight started. Another time, it didn't even say "starting soon" it just went back to 59 minutes One possibility is that bosses start less frequently than the hologram suggests (i.e. every 4 hours) and the hologram doesn't display the number of hours, I plan to go AFK and can provide further info based on chat logs