The Alarms and Settings apps do seem out of date, so it would help to update those to the correct versions.
I'm not seeing that issue with "Monday" or "Tuesday" in the settings menu either.
Just had a thought - what's your timezone?
I think it could be timezone related - so maybe it worked ok, but then your timezone updated and that threw the day namings off?
@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.
The Alarms and Settings apps do seem out of date, so it would help to update those to the correct versions.
I'm not seeing that issue with "Monday" or "Tuesday" in the settings menu either.
Just had a thought - what's your timezone?
I think it could be timezone related - so maybe it worked ok, but then your timezone updated and that threw the day namings off?