Not nearly enough info. What sort of deficit are you running? Large(>30%), moderate (20%) or small (10-15%) Are you doing a ketogenic diet (carbs less than 50g a day)? Are you training on depleted glycogen or not? If so do you have regular carb reloads scheduled to replenish glycogen?
If you're doing a ketogenic diet then you've lost mostly water weight, etc.
The way to maintain your lifts is to a)keep a high protein intake, b)take carbs around workouts, c)maintain intensity (bar speed and weight) but you can cut volume down quite a lot, around 10-12 reps is sufficient.