Drain current is proportional to W/L ratio
Transconductance is also proportional to W/L
Current mirror ratios are same
OTA transconductance is derivative of Io/derivative of vid
12/9≈1.35 so, were is the issue? 1.6nA is a result of 10 times difference in V_DS.
The same principle applies to transistors in subthreshold operation. Imagine if all of them are in saturation (Vds>100mV), that would be like two current sources in series (Yikes!).
No. What you have works properly. The three series transistors work as a composite device. You can verify this by analyzing this problem.
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