If you keep a tab with an order open, after some time the time left will decrease by 12 hours. This is very annoying as when you have 11 hours left on the order it says you are 1 hour late, I can’t count the number of times it happened to me and caused me to panic and rush the order, even though I had plenty of time left. If you refresh the page though, it will show the correct time left.
I don’t know what causes this, might be a coincidence but now it happened shortly after midnight (00:00 on my clock), so probably some script that uses the system time instead of the unix timestamp and doesn’t check to see if the user has 24-hour or 12-hour time on the system, just a guess.