[as2]hit detection error

hi

i have made a game which is complete, please check here

http://www.netsparkz.com/fredrikgame/index.html

however I am facing a problem. the movieclip which is dropping down and has to be caught by the umbrella gets hit detected twice sometimes so if you check the points you will see it jumps two points up sometimes rather than once.

the umbrella has a thin line as a movieclip which does the hit detection…

any help would be highly appreciated

thx