That is odd. Looks like a small pole atop a bigger pole. Then again, when you save to your computer and really zoom in it looks like a light refraction.
Its a pixel saturation. Like I said, probably sunlight reflected right off (likely) the backplate of the Phoenix lander which held the parachute system.
The Spirit and Opportunity rovers both saw this when they looked at their heat shields.
Its not unusual or strange at all.