Setting the average concentration in a region affects the adjacent regions?

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I have a simulation where the Events system is used to set the average concentration of a domain when certain points in time are reached. Despite only the one domain being selected, whenever this happens it affects the adjacent domains too. Is there a way to prevent this happening? I've checked to make sure it's not just that my time interval is too large-this behavior happens even at a time interval of 0.001 seconds.


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