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LTC3803 isolated DC/DC

I designed PoE power supply with using LTC3803, and it's work fine in non-isolated variant, but  i have problems with isolated variant. 

Schematic of isolated variant:

It doesn't work the way I want it to. By changing resistors R41 and R43, I cannot set more than 4V, but I need 5V.
I simulated it in LTspice and everything works fine.
Maybe you know why it doesn't work?

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