Forum:Time and Mob Glitches

I'm running a private server for my friends and me, and I noticed the time will randomly change all the time. 4:00 am will go back to midnight, dusk will suddenly turn into 8:00 am. I've tried reinstalling Terraria, that didn't help. It's causing night mobs to run around during the day. I've also noticed when I hit a mob, they'll be way back somewhere without knockback. Or when they come at me, suddenly they're somewhere where they just were and it takes several tries for them to reach me. When they're finally dead after this weird teleporting thing, their loot is off somewhere else. Does anyone have any ideas?