onBeaconsDiscovered shows beacons in list after they disappear

Hi, I wrote a simple app that ranging beacons. I’m using ranging listener to discover the beacons but i noticed that when a beacon disappear (with the flip mode or bringing it far away) it continues to be in the list of onBeaconsDiscovered for about 20 second with the last rssi value.
Is there any option for reset completely that list?