I almost wanted to say it was desync... but 5-6 minutes? We play on this server daily. We have a base on it, and I never ping over 50-60 and have minimal desync. Through the entire firefight I noticed no lag or desync at all. We threw the grenade, picked the "Dud" back up in a whole different spot from where it was thrown, then it glitched back to where it had been thrown and blew up over 5 minutes after the pin was pulled.