You have probably changed the triggers, because in the original file, the trigger "adding a unit after loss" is set to be applied to "First Matching Selection".
Your trigger seems to run on "All Matching Selections", hence the problem, i.e. the trigger action is fired three times, for each qualifying selection. Just set it back to "First Matching Selections".
Generally, in any triggers that deal with the size of a bet after a loss or a win, it is always better to apply them to "First Matching Selection".