Apparently your source for flight info isn't always accurate. My last leg yesterday never auto filled after we landed. I checked the info on APDL.net and it had the wrong destination, tail number and times listed for our flight number.
It looks like your UTC departure date is the 23rd? Therefore if you use the 23rd in the APDL.net lookup it will work. Make sure your scheduled OUT is correct for this flight departing from IAH and AutoFill should find it, assuming you have the time entered correctly which you can cross-ref in UTC on the bottom of the input.