Can someone please tell me?

I may sound like a retard for asking this question but it is something weird that I noticed yesterday. It just started to happen. So I am driving and I use my right hand turn signal and I look down and the little arrow that blinks when you have your blinker on and it was blinking really really fast. So naturally, I test out the left one and it's normal. So when I get to my house I leave the right turn signal on and get out of the car to see if the bulb was ok because I thought it could be that and the bulb was fine. What's up with this?