[FabHK]

FWIW, I've had the expiry month of credit cards stored in Safari increment on occasion (leading to failed online payments, trouble getting a flight, etc.) several times, to the extent that I now always include the expiry month in the card nickname. Mind boggling.

[alpinisme]

I thought I must have misentered it once and it’s always stuck on that but now you’ve got me thinking

[mh-]

If you hit save too fast while a numeric dial control - like the sort used in the iOS Clock app for alarms - is still (barely) spinning.. it will happily just silently keep its old value.

This is easy to repro by spinning an alarm's minutes and hitting save before it's completely and utterly stopped.

This UI bug (?) has existed for as long as I can remember.