Test with - external -different pullup resistors: 10K, 4.7K 1K 470R... If this does not help, I don't know what to say...
Or - if possible with the overall setup - make the switches connect to 3.3V (or 5V). Pico inputs are 5V tolerant. If it's not working with built in "input_pulldown", use same external resistors...
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