I have gone through the project and reproduced the problem you are facing at my side.
The issue got resolved when I added the lines before and after calling the CySysPmDeepSleep( ) API.
I made the above changes because in your code the line Pin_1_SetInterruptMode(Pin_1_0_INTR, Pin_1_INTR_NONE); is present after the CySysPmSleep(); API and because of that the Pin interrupt is disabled. Even I if disable Pin_1_SetInterruptMode(Pin_1_0_INTR, Pin_1_INTR_NONE); your project is working fine.
We recommend you to keep the Pin_1 Drive mode as Resistive pull-up instead of High impedance digital. Please try this and update if it is working same for you.
Non way to answer on web page…
Thanks a lot
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