Since we cannot see your profile, its hard to tell but usual suspects is double check ALL of your gear pieces and sets and make sure you are receiving all of the set bonuses along with cube. RoRG not being equipped is a common mistake.
From what you say, you changed something on your gear to lose a bonus.
Your damage and toughness just dont “vanish” without player error. Nor is there a bug that does so else it would be far more widely reported by people with more then 0 or a few posts (ones that have been around for a while).
99.9% of it being reported is player error.