take a photo of your A16 PCB board, post at here.
maybe you need change your PCF8574 i2c address, here is details:
https://www.kincony.com/forum/showthread.php?tid=2128
maybe you need change your PCF8574 i2c address, here is details:
https://www.kincony.com/forum/showthread.php?tid=2128