Hi
I think what is happening here is that an autodutch opportunity is found and the bets are fired in, but because stop after each dutch is switched off, and the prices for the dutch opportunity remain static for 4 seconds, the autodutch will continue to repeat until the prices change and there is no longer a dutching opportunity. If you are going to use autodutch repetitively it is better to have a very fast refresh rate.
Larp's suggestion of using a trigger is a much better idea because you can put in conditions to prevent this sort of thing happening while using a slower market refresh rate.