Alarm Clock changes time by itself

I was listening to the radio earlier today and I noticed something kind of weird. The host said the time and then I looked at my alarm clock and it was 20 minutes fast. I thought that maybe the radio was wrong, but my cell phone, laptop and watch all had the correct time.

Last night I did play with the alarm clock, I tried changing the radio stations and change the brightness from low to hi. I don't see how any of these things could have changed the time. Maybe my cat changed the time. She now likes to sit on my laptop keyboard.

Update: I checked the alarm clock later in the evening. The time on the alarm clock said 9:32pm. My cell phone said 9:20. I turned the brightness from high back to low and the alarm clock has kept the correct time. I shoudln't buy any more electronics from Meijer.