LTC2955-2 Enable not pulled low as expected

Hi,

1. VIN = 3.6V, but we measure only 2.0V on the PB line when the switch is not pressed. Why? Any reason?

2. When I press the push button, the Enable pin goes low for a few seconds, and then it jumps to logic high. How to hold enable on logic low state until I trigger to turn off.

Circuit diagram attached for the reference.

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