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The LTspice model simulation output of ltm8049 is not as expected

Category: Hardware
Product Number: LTM8049
Software Version: LTspice XVII(17.0.35.0)

Hi, when I simulate the output of ltm8049 with LTspice tool, I find that the output was incorrect. Using the demo schematic provided by your company, I just chang the input from 12v to 3.3v. Then observe that Vout_ 1 is only+8.5V and Vout_ 2 output is only -8.0V, both of which are  less than ±12V.  Similarly, pg signal is always at gnd level.

I really don't understand why. How can I avoid this problem?  Thank you very much!