It's probably because of the gametype. If it does not say "infinity" in the gametype when voting for the maps, it means that everyone starts with default loadouts. If it does in fact, say infinity, those gametypes will include your pre-set loadouts.
Every day since I downloaded Champions Bundle all my level points are refunded and I have to go through the loadout menu and buy everything all over again.
I got the Bundle on the release date and that just started happening to me yesterday. I thought that I was in a game type that didn't allow the jet packs, thrusters, camo etc. until I realized that everyone was using them except me.