That makes me feel a bit better, hopefully that is the case. Saturday I had the same issue, MBW showed 1.25" and WU showed 1.30".
Whatever the cause, I'm hoping Acurite might consider changing the way the bridge sends rain data. The way it's working now, rain data is lost if a message to MBW gets missed. If the 5n1 really is sending a rolling counter/accumulation, why don't the send that instead of the rainfall in 36 seconds? It seems like it would make the whole system much more trustworthy.