Contact sensor not using range extender

I just completed install of an 8 piece Gen2 kit. I have 2 door sensors in the same room, and one of them consistent shows the weak signal icon in the app. It reliably shows open and closed. The other door sensor in the same room shows no issues. I've played around with placement of the range extender and it has had no effect on the signal of this door sensor. I've removed and reconnected the sensor and the range extender to no effect. Is there any way to see what sensors are using the range extender, or does anybody have any other diagnostic tips?