Problems with stops in play

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I'm having trouble with the stops being placed in play.

Here is an example:

My lay bet is matched at 5.9

Stop trigger 70% Placed at 90%

Log says error matching at 1.01 and no back bet stop is matched.

What's going on here? The back should be placed much higher than 1.01, even if it doesn't get matched.

Is the software having trouble calculating the 90%?

Or is just that the odds are swinging around so hard that it just shits itself?

I have a suspicion that it's first converting the small lay bet into the required odds by going through 1.01 first, but can't get the conversion finished because the race finishes and it runs out of time.

Any ideas?

EDIT: It's happening at all sorts of prices. Just now at a lay price of 2.04, tried to enter the stop at 1.01