Automation help please

[Grinderman]

I backed £500 on a selection in The Masters golf at 36 and put in a £500 lay at 34. Money was stacked up to back him at 36, but I wanted to cover a drift back out to 36. I didn't have enough cash to leave the lay at 34 and put in a lay at 36.

So, I created a rule to cancel all bets on selection, always armed, if his back odds went to 36.
I created a second rule to place a lay bet on selection at 36, always armed, if his back odds went to 36.

Sure enough, he went to 36, but I didn't get my lay bet in at 36. I checked the log and it said that I had insufficient funds to cover the lay. The second line said that it had managed to cancel my bets on selection.

Obviously, the lay bet must have triggered first. But in the rule list at the top of the screen, it was definitely cancel first, then lay.

Any ideas please?