Hi
Please check:
You have restarted marketfeeder, this ensures all win/lose history variables are at zero before any triggering starts.
Do not delete the last settled market as the trigger requires it to be in My Markets, you can delete subsequent, but to be on the safe side use this setting:
Settings > General Options > Delete all but the 5 most recent markets
If you are changing the initial bet to below the betfair £2 minimum, tick this setting:
Settings > Betting Options > Allow small bets