Could you please share the WisGateOS 2 web interface configuration screen again? Are you still using the built-in network server settings?
Currently its now connected and sending the uplinks from the tags to the ttn. Now i have beacons placed in open layout office corners, when i move the tag close to one of the beacon, it shows other beacons mac too. what is the appropriate way to arrange the beacons so that it can detect closed beacon at a time?
The CP28 iBeacon product page states that the range is around 100m.

But to place the iBeacon in an appropriate location, you may want to refer to the RSSI detected by the dedicated app. - https://play.google.com/store/apps/details?id=com.dxlq.ibeacon&hl=en