ESP8266 Requires RST Button Press on SMPS Power-Up

I am facing an issue with my SMPS-powered ESP8266 (ESP-12F) where I need to manually press the RST button on power-up for the program to execute. GPIO0, EN, and RST are pulled up with 10K ohm resistors, and GPIO15 is pulled down. Seeking advice to address this behavior. Thanks!

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