Check your timezone is the same as wunderground is expecting. You should be able to do this by going to the live data tab and confirming the Receiver time is correct. If it's not, go to the Station Setting tab and update the timezone.
I have an Aercus model station which uses almost identical software and have run in to this problem before.
I have an Aercus model station which uses almost identical software and have run in to this problem before.