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LT3471 simulation issue in LTspice

Hi,

I'm simulating LT3471 to give output of +/- 6V at 50mA each from 3.3V input supply. Negative side convertor is OK working at 1.2Mhz but positive side is working at around 7 Khz. 

Is my converter going into some low frequency mode ? Why is it so ?

Thanks.