TLV61070A: How to parallel 2 boost converter as positive/negative dual rail power supply?

I read here circuit which can generate positive/negative dual rail power supply with buck converter:

I'd like do it with boost converter: Converting +5V to +5.5V and -5.5V with 2 boost converter.

I've downloaded TLV61070A pspice model demo

Official demonstrating circuit of TLV61070A is no problem. I tried to modify a little--

make 2 TLV61070A as parallel:

But result of simulated is very strange:

Does anybody tell me how to make correct positive/negative dual rail power supply with 2 boost converter? Many thanks!