CC1352R: sensor is send data to collector but data is not reached to collector

Part Number: CC1352R

hello,

I am using simplelink_cc13x2_26x2_sdk_4_40_04_04.

I have followed below steps:

1. Connected two sensors to the collector. it is working fine here.

2. I have erased the sensors code, flash the code, and rejoined two sensors to the same collector(i haven't removed sensor details in the collector).

3. sensors sending data to collector. 

4. power off the collector for some time.  and power it on the collector. Both sensors rejoined in the network. But collector is receiving only one sensor data.

why the collector is not receiving one sensor data??