Joe, you ether lost weight, or a trinket is no longer charged.
Open your character page, and gaze onto right side that has these numbers. Under the stats, and under Melee Damage Bonus you will see a Weight Number & (Classification)
When you take damage to reserves Health & Stamina in the 'Statistics' page than your hidden weight modifier goes down until you lose weight.
I recommend getting some food that has good 'Health' stats per unit and eat that until you gain enough weight to regain the (Stoute) characteristic. Note that in the chat window you will get a warning of if you are about to go overweight from eating, if you are currently (Fit) than this is a good thing. I recommend eating until you are (Stoute) and near the end of it when it is warning you if you are about to go overweight again, you can stop eating by pulling your weapon out.
If this is not the problem than make sure you do not have trinkets that are not charged, I do not know how you would of gotten +5 on any ring or if you somehow have +2 and +3.
Make sure it is charged and equipped if this is the case.