And you didn't reset Puck.js at all between times? Perhaps you could try disconnecting and then reconnecting on the PC?
Please can you post up a screenshot of the Bluetooth menu on the PC?
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
And you didn't reset Puck.js at all between times? Perhaps you could try disconnecting and then reconnecting on the PC?
Please can you post up a screenshot of the Bluetooth menu on the PC?