Preface: I've read nothing other than the OP, so this may be a repost
When management goes in to alter your time card, you
will not see the changes on the computer when you clock in and out. I don't know why but it's almost like a separate application altogether handles timecard changes, and the hourlies don't see management's manual changes until they get a look at their pay stub at the end of the week (my experience, but it's possible I'm mistaken and have been
ed over in the past.. I mean, this
is UPS, after all....)
So, and this is giving your supervisor the benefit of the doubt here, if he did make a change to your timecard, it
would not have shown on the clock-out computer that same day but it
will show on your pay stub for that work-week. Again, just from my experience. It makes no sense to me but that's how it seems to work.