Problem with time data on this morning's bars (T-bond)

["Owen Davies" <owen@xxxxxxxxxxxxx>]

Okay, here's one I find really wierd.

I'm running a bunch of charts on T-bonds, from
1-minute to daily.  My 1-minute bars have had the
right times on them.  (Well, okay, they read one minute
ahead of my computer clock, even though I periodically
reset the clock to the NIST atomic clock, but at least
it's consistent.)  My longer bars started off reading
9:20 (this at 8:20, of course)and incremented from there:
9:20:01, 9:20:02, 9:20:03, and so on.  Now that it's
past 9:20, things seem to have returned to normal.
Does anyone understand what's going on here?
Or know what to do about it?

Many thanks.

Owen Davies