Rodrigo, I'm 99% sure this happened because the bets MF Pro was cancelling were taken that very moment, and so the program was assuming they were not there, so placed more bets. I'm judging by the log message "TAKEN_OR_LAPSED" which can be seen in your log file. It is issued by BetFair when a bet you are trying to update or cancel is already matched or cancelled.
The bets were being cancelled most probably for the sake of Stop-Loss.
So sadly no amount of installing or reinstalling will help, it is an example of a bad coincidence.
The program could theoretically wait for another several seconds to check if the bets were really cancelled, but that would delay the Stop-Loss significantly.