1987 Suzuki Mehran Dragging clutch

I just rebuild engine of my car and replaced the flywheel, pressure place, clutch plate, thrust bearing, clutch cable, and also check all that was possible related to clutch system. I adjusted the cable to extreme low and high as well. The issue is my car keeps on moving in first and second gear even if the clutch is fully depressed. This mostly happens when I am in traffic jam and need to move car in first or second gear. When this happens it becomes very difficult to change gear from first to second.