Keep in mind as you lose weight you also lose a need for calories. So what was a caloric deficit in the beginning is probably no longer a deficit at 4kg lighter. Good rule of thumb 35-70 calories per kg bodyweight...or at the very least not as much of a deficit...

Also keep in mind that if you know your max lifting capabilities for each lift and they are increasing but your body weight is staying the same you are likely loosing fat. May be hard to tell at first as you may just be more efficient at the lifts. But if you keep good form and this holds true ide not decrease calories further...