This is phycics lab. The table below showed the results of compounded two pulley system with the top pulley fixed position.

Does it make sense to have MA so much lower than TMA? Please explain the factor for my hands on experiment why the efficiency less than 100?

Number of Washers	Weight Fout(N)	Effort Force Fin,actual Actual (N)	Effort Force Fin, theory Theoretical (N)	Actual Mechanical Advantage MA	Theoretical Mechanical Advantage TMA	Efficiency (%)
1	0.491	0.50	0.25	0.98	2	49
2	0.589	0.56	0.29	1.05	2	53
3	0.785	0.60	0.39	1.31	2	65
4	0.883	0.68	0.44	1.30	2	65
5	0.981	0.70	0.49	1.40	2	70