make me tigger

According to the log, all bets were completed in the market for which you attached the log:

18:25:03 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 30.03 at 5.80 on selection 'Reeking Havoc'. Bet is matched. If unmatched, bet will be kept at In-Play. The bet was placed/cancelled by Trigger "Back Dutching". 
18:25:03 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 20.25 at 8.60 on selection 'Calling Time'. Bet is matched. If unmatched, bet will be kept at In-Play. The bet was placed/cancelled by Trigger "Back Dutching". 
18:25:03 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 15.84 at 11.00 on selection 'Goodnite Irina'. Bet is matched. If unmatched, bet will be kept at In-Play. The bet was placed/cancelled by Trigger "Back Dutching". 
18:25:03 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 9.68 at 18.00 on selection 'Galtee Mist'. Bet is matched. If unmatched, bet will be kept at In-Play. The bet was placed/cancelled by Trigger "Back Dutching". 
18:25:03 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 8.29 at 21.00 on selection 'Annie Pender'. Bet is matched. If unmatched, bet will be kept at In-Play. The bet was placed/cancelled by Trigger "Back Dutching". 
18:25:03 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 3.63 at 48.00 on selection 'Lyfka'. Bet is matched. If unmatched, bet will be kept at In-Play. The bet was placed/cancelled by Trigger "Back Dutching". 


18:32:54 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 43.55 at 4.00 on selection 'Festina Plente'. Bet is matched. The bet was placed/cancelled by Trigger "Dutch the rest of the horses". 
18:32:54 Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap: Going to  BACK £ 31.11 at 5.60 on selection 'Highly Approved'. Bet is matched. The bet was placed/cancelled by Trigger "Dutch the rest of the horses". 

The market was then settled with a profit of 11.23 GBP:

18:35:10 Market: Horse Racing / IRE / Rosc  8th Jul / 18:30 Rosc  8th Jul - 7f Hcap. All test bets have been settled. Last P/L: + 11.23.List of winners: Calling Time.Source: BetFair

A number of other markets were also settled with profit, which indicates that the situation you described:

Hello, i have tested it all day, but it doesn't work, it places the first bets but doesn't place the later bets 

does not correspond to what I see in the file.

I confirm, not always when departing does the duth in positions 1 and 2

I confirm, not always when departing does the duth in positions 1 and 2

If the prices are not high enough, the Dutching will be impossible, and the bets will never be placed. You can choose to close the bets with loss if you set the close_secs variable to a non-zero value.

I'm trying this trigger and with close_sec set to 1, it works great.

on a default basis € 1 is lost 0.05 and you win from € 0.30 to € 4.00
I think it's a good strategy, I continue the test.

if the runners are less than 6 you always go at a loss

is there a way to change the last bet to like 3-4 instead or 1-2

Yes, by setting max_rank to 4.

Floyd, could you share the global variable settings so I launch the backtest?
what value do you put on close_secs?
wouldn't it be the case to exclude races with less than 5 runners?