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Offset Voltage in Op-amp simulation problem.

Hi! I want to measure the offset voltage of an opamp. First, I
configure the opamp in an unity gain buffer and measure the output.
The offset voltage is 64.16uV. Then, I applied this voltage to the non-
inverting input of the opamp. When I simulate it again, instead of
getting 0V at the output, I get 464.29mV. Is the setup correct? Is the
offset voltage of 64.16uV correct? Looks a bit small for an opamp.

Thanks.
Amy

* Schematics Netlist *

I_I1 0 $N_0001 DC 100u
M_M1 $N_0002 $N_0002 $N_0003 $N_0003 Mbreakp
+ L=1u
+ W=50u
M_M2 $N_0004 $N_0002 $N_0003 $N_0003 Mbreakp
+ L=1u
+ W=50u
M_M6 $N_0001 $N_0001 $N_0005 $N_0005 MbreakN-X2
+ L=1u
+ W=10u
V_V1 $N_0003 0 5V
V_V2 0 $N_0005 5V
R_R1 $N_0007 $N_0006 12.245k
M_M8 $N_0006 $N_0004 $N_0003 $N_0003 MbreakP
+ L=1u
+ W=100u
M_M14 $N_0003 $N_0006 VOUT VOUT MbreakN-X7
+ L=1u
+ W=10u
M_M7 $N_0007 $N_0001 $N_0005 $N_0005 MbreakN-X4
+ L=1u
+ W=20u
M_M5 $N_0008 $N_0001 $N_0005 $N_0005 MbreakN-X3
+ L=1u
+ W=20u
M_M15 $N_0005 $N_0007 VOUT VOUT MbreakP
+ L=1u
+ W=25u
M_M4 $N_0004 $N_0009 $N_0008 $N_0008 MbreakN
+ L=1u
+ W=20u
M_M3 $N_0002 $N_0010 $N_0008 $N_0008 MbreakN
+ L=1u
+ W=20u
V_V8 $N_0010 0 0V
V_V9 $N_0009 $N_0010 -64.16u
 
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