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contest vs backtest beta

when entering a contest, the system launches a backtest to gather backtest statistics. On the leaderboard, my backtest statistics for beta is different than the backtest itself.

shown on leaderboard, i have a beta of 0.03393 but in beta tab of backtest, i have the following:

BETA 12 MONTH
August 2014 N/A
September 2014 N/A
October 2014 N/A
November 2014 N/A
December 2014 N/A
January 2015 N/A
February 2015 N/A
March 2015 N/A
April 2015 N/A
May 2015 N/A
June 2015 N/A
July 2015 -0.004
August 2015 0.011
September 2015 -0.005
October 2015 -0.01
November 2015 -0.008
December 2015 -0.006
January 2016 -0.026
February 2016 -0.034
March 2016 -0.034
April 2016 -0.0351
May 2016 -0.034
June 2016 -0.042
July 2016 -0.043
August 2016 -0.064
September 2016 -0.0691