RSSI problems 202 Beacon

Hi. I’m creating an Android App that search the beacon every 40ms for 32 times. The 202 beacon has a txPower of -23bd and an AdInterval of 400ms.

A lot of times the scan of a beacon that is farther than an another beacon return an RSSI that is greater than the closer beacon. Example

Beacon A: Real Distance: 0,5 mt
RSSI: -89db

Beacon B: RealDistance: 1,2 mt
RSSI: -82db

Is there anyone that can help me?

Did battery of beacon A is to low or two beacons was at the same environment ?
RSSI will be affected by the environment and the battery is not enough

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