For throubleshooting, the following didn't give me enough thing to see what happens with this two ip addresses...
1-) >sh arp | match <ip address> ------>to get mac address
2-) >sh ethernet-switching table | match <mac address> -----> to get associated interface on the switch. but this is only showing irb interface not physical interface. So it didn't help further...
3-) >sh route forwarding-table destination <ip address> -----> this showed that its associated L3 vlan interface -irb which sits on the same ex switch...
4-) >monitor traffic interface irb.xx matching "host <ipaddress>" no-resolve size 7000---->this nothing showed.
5-) After 4th step, accedently typing https://<Ip address> on my windows machine ---->a website came up and showed somehting relating to video conferanse and prompting username/password. Strangely both ip addresses showed the same website. So it can be understood 2 different Ip addresses are for only one facility!
Still the case is not visible but one of the key points is why we can not see which physical interface is associated to?
What do you think this troublehooting is correct or not, if not, what should be taken?