[Bad HAL 9000]

This has been driving me completly nuts the last few weeks. I put something on my calendar and when I check it next the time will shift an hour up or down. If I notice I change it back to what it should be. But then I check it again a day later or so and it's shifted again. I have applied the DST patch and my clock is set to my home time and is correct. This is driving me insane, I have missed a few meetings because of it.

Anyone know what is going on? Or have a suggested fix?