I get there can be slow connections but some of us are seeing monsters at 100% long after they have been hit by others. This is causing trouble between guilds. Its rather new of an issue, id say past 2-3 weeks maybe.
I've seen this happen too, especially when you hit a monster and shows damage in report but when you check the monsters cords it still shows 100%. Yet the damage still gets done, eventually after you refreshed the map, by going into turf and back out or something it can eventually show the correct health.